P&WC S.B. No. 1244R21 BULLETIN INDEX LOCATOR · PDF fileREVISION TRANSMITTAL SHEET TURBOPROP...

BULLETIN INDEX LOCATORTURBOPROP ENGINE

ENGINE FUELS AND ADDITIVES - REQUIREMENTS AND APPROVED LISTING

MODEL APPLICATION

PT6A-6, PT6A-6A, PT6A-6B, PT6A-6/C20, PT6A-20, PT6A-20A, PT6A-20B, PT6A-21, PT6A-25,PT6A-25A, PT6A-25C, PT6A-27, PT6A-28, PT6A-34, PT6A-34B, PT6A-35, PT6A-36,

PT6A-114, PT6A-114A, PT6A-116, PT6A-135, PT6A-135A

Compliance: Refer to Para. 1.E. in the Service Bulletin

Summary: This service bulletin defines the minimum requirements for approved fuels and listsvarious acceptable additives for use in commercially operated engines of the modelslisted.

PRATT & WHITNEY CANADA

SERVICE BULLETINP&WC S.B. No. 1244R21

Jul 24/1975 PT6A-72-1244Revision No. 21: Mar 16/2005 Cover Sheet

24-Hour Global Service USA & CANADA........................ 1-800-268-8000 Other .......................................... 1-450-647-8000

HELP DESK International .................... (IAC*)+8000-268-8000 Fax ............................................. 1-450-647-2888

Toll free where available (SIL GEN-027) * International Access Code Web Site .................................. www.pwc.ca

REVISION TRANSMITTAL SHEETTURBOPROP ENGINE MODEL PT6A

SUBJECT: Pratt & Whitney Canada Service Bulletin No. PT6A-72-1244, Rev. No. 21, dated Mar16/2005 (P&WC S.B. No. 1244R21) ENGINE FUELS AND ADDITIVES -REQUIREMENTS AND APPROVED LISTING

Replace your existing copy of this service bulletin with the attached revised bulletin. Destroy thesuperseded copy.

Please retain this Revision Transmittal Sheet with the revised bulletin.

SUMMARY: This service bulletin is revised to:

v modify the engine model number to read PT6A-6/C20 in lieu of PT6A-6/20C;

v update TABLE 10 to modify the note number since two were deleted.

v update TABLE 11 to add the Ukraine fuel;

EFFECT OF REVISION ON PRIOR ACCOMPLISHMENT:

None.

NOTE: A black bar in the left margin indicates a change in that line of text or figure.

REVISION HISTORY:

Original Issue: Jul 24/1975Revision No. 1: Nov 10/1976Revision No. 2: Jun 09/1977Revision No. 3: Nov 04/1977Revision No. 4: Sep 12/1979Revision No. 5: Dec 19/1979Revision No. 6: Aug 12/1981Revision No. 7: Apr 15/1983Revision No. 8: May 17/1984Revision No. 9: May 21/1985

Revision No. 10: Nov 26/1985Revision No. 11: Apr 18/1986Revision No. 12: Oct 08/1986Revision No. 13: Apr 21/1989Revision No. 14: Jan 29/1990Revision No. 15: Mar 18/1996Revision No. 16: Jun 19/1996Revision No. 17: May 01/1998Revision No. 18: Feb 14/2000Revision No. 19: Apr 12/2002

Revision No. 20: Jan 13/2004Revision No. 21: Mar 16/2005

Pratt & Whitney Canada Corp.1000, Marie-VictorinLongueuil, Québec, Canada J4G 1A1Tél. 450-677-9411

16 March 2005

P&WC S.B. No. 1244R21

1. Planning Information

A. Effectivity

PT6A-6, PT6A-6A, PT6A-6B, PT6A-6/C20, PT6A-20, PT6A-20A, PT6A-20B, PT6A-21,PT6A-25, PT6A-25A, PT6A-25C, PT6A-27, PT6A-28, PT6A-34, PT6A-34B, PT6A-35,PT6A-36, PT6A-114, PT6A-114A, PT6A-116, PT6A-135, PT6A-135A

B. Concurrent Requirements

None.

C. Reason

To assure the use of approved engine fuels and acceptable additives for commerciallyoperated engines of the models listed.

D. Description

This service bulletin defines the minimum requirements for approved fuels and listsvarious acceptable additives for use in commercially operated engines of the modelslisted.

E. Compliance

Pratt & Whitney Canada Inc. recommends that Compliance conform to the requirementsof the Accomplishment Instructions.

F. Approval

Transport Canada has reviewed and approved the technical contents of this ServiceBulletin.

G. Weight and Balance

None.

H. Electrical Load Data

Not changed.

I. Software Accomplishment Summary

Not applicable.

J. References

P&WC Specification CPW204P&WC Specification CPW46

P&WC No. N/A



Jul 24/1975 PT6A-72-1244Revision No. 21: Mar 16/2005 Page 1 of 17© 1975 Pratt & Whitney Canada Corp.

PRINTED IN CANADA

TURBOPROP ENGINEENGINE FUELS AND ADDITIVES - REQUIREMENTS AND APPROVED LISTING

1. Planning Information (Cont’d)

All Applicable PT6A Technical Manuals

K. Publications Affected

None.

L. Interchangeability and Intermixability of Parts

Not applicable.

2. Material Information

A. Industry Support Information

Not applicable.

B. Material - Cost and Availability

Not applicable.

C. Manpower

Not applicable.

D. Material Necessary for Each Engine

Not applicable.

E. Reidentified Parts

None.

F. Tooling - Price and Availability

Not applicable.



Jul 24/1975 PT6A-72-1244Revision No. 21: Mar 16/2005 Page 2 of 17


3. Accomplishment Instructions

WARNING: YOU MUST READ THE MATERIAL SAFETY DATA SHEETS (MSDS)(OCCUPATIONAL SAFETY AND HEALTH ACT (OSHA), FORM 20 OREQUIVALENT) BEFORE YOU USE THESE MATERIALS. SOME MATERIALSCAN BE DANGEROUS. YOU CAN GET THE DATA SHEETS FROM THEMANUFACTURERS OR THE SUPPLIERS OF THESE MATERIALS.

A. The minimum requirements for fuels are as follows:

NOTE: 1. The list of minimum requirements for fuels, as established by SpecificationCPW204, is shown in TABLE 1. Refer to TABLE 10, for the list of acceptablefuels.

NOTE: 2. The following list of fuel properties (Ref. TABLE 1) provides an envelope ofthe minimum requirements that are acceptable for use in Pratt & Whitney ofCanada Inc. commercially operated engines of the models covered by thisService Bulletin. Since these fuel properties address engine requirementsonly, this Service Bulletin is neither intended nor suitable for direct use as apurchase specification for procurement of fuel by operators of P&WCcommercial engines. Rather, it is intended to allow operators to includeminimum approved fuel requirements for P&WC engines in conjunction withother functional requirements when formulating their own procurementspecification or judging the acceptability of fuels manufactured to other nationalspecifications that exist throughout the world.

(1) The technical requirements are as follows:

(a) Test Methods

1 Tests shall be performed, insofar as practicable, in accordance with thelatest issue of the listed American Society for Testing and Materials(ASTM) test methods.

(b) High Temperature Stability

1 The Jet Fuel Thermal Oxidation Tester (JFTOT) ASTM D3241, is the onlyapproved and accepted test method for civil and military fuels.

2 Testing shall be conducted at 260°C (500°F), maximum heater tubetemperature. Maximum pressure change shall be 1.0 inch (25.4 mm) Hg andpre-heater deposit shall be less than Code 3 in accordance with ASTMD3241.

3 If JFTOT test at control temperature of 260°C (500°F) should fail to meetspecification requirements of Step 2, then test shall be conducted at atemperature of 245°C (473°F).

NOTE: The results from both the 260°C and 245°C (500°F and 473°F)Control- temperature tests must be reported by the refiner on allfuel analysis reports.





3. Accomplishment Instructions (Cont’d)

(c) Quality

1 Fuel shall consist solely of hydrocarbon compounds except as otherwisespecified herein. It shall be free from water, sediment, and suspendedmatter, and shall be suitable for use in aircraft turbine engines.

2 The odor of the fuel shall not be nauseating or irritating. No substances ofknown dangerous toxicity under usual conditions of handling and use shallbe used.

TABLE 1, Fuel Properties (CPW 204)

Properties Limits Test Method

Gravity, deg. API, at 59°F (15°C) 37 (0.84 Kg per Litre) to57 (0.75 Kg per Litre)

ASTM D287, D1298, D4052

Distillation Temperature: °F (°C) ASTM D86

10% Evaporated Max. 401 (205)

50% Evaporated Max. 450 (232)

End Point Max. 572 (300)

Loss, % Max. 1.5

Residue, % Max. 1.5

Sulfur, % by Weight Max. 0.40 ASTM D1266, D1552, D2622, D4294 orD5453

Mercaptan Sulfur,% by Weight(See NOTE)

Max. 0.005 ASTM D3227

Net Heat of Combustion, BTU/lb(J/kg)

18,300 Min.(42.6x106) Min.

ASTM D240, D1405, D2382, D3338,D4529, D4809






TABLE 1, Fuel Properties (CPW 204) (Cont’d)


Freezing Point,°F (°C)

Max. −40 (−40) ASTM D2386

Reid Vapor Pressure,psi (kPa)

Max. 3 (21) ASTM D323

Aromatic Content,% by volume

Max. 25 ASTM D1319

Burning Quality:

Luminometer Number 45 Min. ASTM D1740

or Smoke Point 25 mm. Min. ASTM D1322

or Smoke Point + Naphthalenes 25 mm. min. +3% vol. max.

ASTM D1322, D1840

Copper Strip CorrosionASTM Code No.

Max. 1b ASTM D130Temp: 212 °F± 1.8 (100 °C ± 1)Time: 2 Hours

Viscosity,cs at−30°F (−34.4°C)

Max. 16.5 ASTM D445

Water Reaction,Volume Change, ml

Max. 1 ASTM D1094

Water Reaction,Interface rating

Max. 1-b ASTM D1094






TABLE 1, Fuel Properties (CPW 204) (Cont’d)


NOTE: Mercaptan sulfur determination may be omitted provided Doctor Test in accordance withASTM D4952 is conducted and results are negative.

B. The limits for the use of oxidation inhibitors are as follows:

(1) One or a combination of the following oxidation inhibitors may be added to thebasic fuel in total concentration not greater than 25 milligrams per liter (0.025 g/l)to prevent formation of gum:

v 2, 6 - Ditertiary - Butylphenol.

v 2, 6 - Ditertiary - Butyl - 4 - Methylphenol.

v 2, 4 - Dimethyl - 6 - Tertiary - Butylphenol.

v 75% Min. 2,6 - Ditertiary - Butylphenol and25% Max. Tertiary - Butylphenol and Tritertiary - Butylphenol.

v 55% Min. 2,4 - Dimethyl - 6 Tertiary Butylphenol and15% Min. 2.6 Ditertiary - Butyl-4-Methylphenol and30% Max. mixed Methyl and Dimethyl Tertiary-Butylphenol.

v 72% Min. 2,4 - Dimethyl - 6 Tertiary Butylphenol and28% Max. Tertiary - Butyl Methylphenol and Tertiary Butyl Dimethylphenol.

C. The limits for the use of fuel aditives are as follows:

(1) The following additives in addition to the oxidation inhibitors listed under Para. 3.B.,are acceptable for use in engine fuel subject to the limitations that follow:

NOTE: These fuel additives were approved on the basis of information receivedfrom manufacturers or suppliers of the additives. Analysis of thisinformation and results of tests on product samples have indicated nosignificant adverse effect on engine materials provided the concentrationdoes not exceed the recommended maximum.






(a) Anti-corrosion and Fuel Lubricity Improver Additives (Ref. TABLE 2)

1 Anti-corrosion and lubricity additives are described as being primarilycorrosion inhibitors and secondarily as lubricity improvers, to meet asimilarly defined U.S. Military Specification. In certain cases it is necessaryto adjust concentration of such additives to obtain necessary lubricityimprovement. Only products listed in TABLE 2 have been tested andapproved, by P&WC as both corrosion inhibitors and lubricity improvers atthe concentration specified.

NOTE: Extensive operation on low lubricity fuel can result in acceleratedengine fuel pump wear. Until a generally accepted method ofmeasuring and defining fuel lubricity is available, rapid fuel pumpwear should be considered an indication of low lubricity fueland dictates a change in the fuel or the addition of a lubricityimprover. The corrosion inhibitor and fuel lubricity improver additivesare approved for the concentrations listed in TABLE 2.

TABLE 2, Anti-corrosion and Fuel Lubricity Improver Additives

Additive(Trade Name)

Maximum Concentration Allowedlb. per 1000 Barrels

Maximum Concentration AllowedGrams per 10,000 Liters

Apollo PRI-19 8 225

Cooper Hiltec E-580 8 225

Dupont DCI-4A 8 225

Mobilad F-800 8 225

Nalco 5403 8 225

(b) Thermal Stability Additives (Ref. TABLE 3)

1 TABLE 3 specifies a thermal stability additive approved for use in enginefuel, at the option of the refiner, to ensure adequate high temperaturestability at the time of use.

2 The thermal stability additive has been shown to improve jet fuel thermalstability, and in some applications to significantly reduce fuel nozzlecoking and to improve hot section cleanliness. This additive consists of anantioxydant, a metal deactivator, and a dispersant. It is approved foruse in engine which are identical to each other, except that Turboline FS100is diluted.






TABLE 3, Thermal Stability additive




AeroShell Performance Additive 101 95 3000

BetzDearbon Spec Aid 8Q462 95 3000

Dupont JFA-5 30 855

Turboline FS100 197 6250

Turboline FS100-Concentrate 95 3000

(c) Metal Deactivator (Ref. TABLE 4)

1 TABLE 4 specifies an approved metal deactivator.

TABLE 4, Metal Deactivator




N, N1 - Disalicylidene -1, 2 Propane - Diamine 2 57

(d) Anti-icing Additives (Ref. TABLE 5)

WARNING: YOU MUST READ THE MATERIAL SAFETY DATA SHEETS(MSDS) (OCCUPATIONAL SAFETY AND HEALTH ACT (OSHA),FORM 20 OR EQUIVALENT) BEFORE YOU USE THESEMATERIALS. SOME MATERIALS CAN BE DANGEROUS. YOUCAN GET THE DATA SHEETS FROM THE MANUFACTURERSOR THE SUPPLIERS OF THESE MATERIALS.

1 Any anti-icing additive which is directly equivalent to those listed inTABLE 5 is approved.

TABLE 5, Anti-icing Additives


Maximum ConcentrationAllowed, Percentage

by Volume

Ethylene GlycolMonomethyl Ether 0.15

Diethylene Glycol Monomethyl Ether(Diegme)

0.15






TABLE 5, Anti-icing Additives (Cont’d)


Maximum ConcentrationAllowed, Percentage

by Volume

Liquid I (GOST 8313) 0.3

(e) Anti-static Additives (Ref. TABLE 6)

1 TABLE 6 specifies approved anti-static additives.

TABLE 6, Anti-static additives


Maximum ConcentrationAllowed, Parts

per Million by Weight

Dupont Stadis 450 3.0

(f) Anti-microbial Organisms Additive (Ref. TABLE 7)

1 TABLE 7 specifies anti-microbial organisms additives for use on the specificbasis. Specific basis is defined as intermittent or non-continuous use in asingle application to sterilize aircraft systems suspected or found to becontaminated by microbial organisms, such as fungi, bacteria andyeasts. For those operators, where the need for biocide use is indicated,Pratt & Whitney recommends, as a guide, a dosage interval of once a month.This interval can then be adjusted, either greater or lesser, as anoperator’s own experience dictates. Engines operated in private andexecutive aircraft, where overhaul periods and utilization are relatively low,may use the additive continuously.

TABLE 7, Anti-microbial Organisms Additives


Maximum ConcentrationAllowed, Parts perMillion by Weight

Biobor JF 270

Kathon FP 1.5 100






(g) Leak Detection Additives (Ref. TABLE 8)

1 TABLE 8 specifies additives that may be required by locationairport/environment authorities for the purpose of detecting leaks in airportfuel distribution systems.

TABLE 8, Leak Detection Additives



Tracer A (Sulfer Hexafluoride, SF6) 1

(h) Anti-smoke Additives (Ref. TABLE 9)

1 TABLE 9 specifies additives that may only be used in post overhaul testcell operation of engines for maximum of five (5) hours duration. Theyare not approved for flight use.

TABLE 9, Anti-smoke Additives



Hitec 3000 0.10

Apollo DGT-2 0.10

D. The list of acceptable fuels (unrestricted use) is as follows:

(1) Fuels listed in TABLE 10 comply with P&WC specifications and are approved forunrestricted use in the listed engine models.

NOTE: 1. Unless otherwise specified, the latest issue of fuel specifications applies.

NOTE: 2. An acceptable fuel or any mixture of acceptable fuels may be used.However, changing to a fuel with a substantially different heating value orspecific gravity may require maintenance in the form of engine fuelcontrol (trimmer) adjustment.

NOTE: 3. The operation of P&WC commercial engines covered by this ServiceBulletin on fuels other than the approved Jet fuels is not permittedwithout the express permission of P&WC.






TABLE 10, Approved Fuels

ISSUINGAUTHORITY/

BODY

KERO-SENETYPE

FREEZEPOINT°C (°F)

WIDE CUTTYPE


HIGHFLASHKERO-SENETYPE


Associations:

ASTM (D1655) Jet AJet A-1

−40 (−40)−47 (−53)

Jet B-

−50 (−58)-

---

---

IATA KeroseneType Fuel

−47 (−53) Wide CutType Fuel

−50 (−58) - -

Military:

US MIL-PRF-5624 - - JP-4(SeeNote 1)

−58 (−72) JP-5(SeeNote 1)

−46 (−51)

US MIL-DTL-83133 JP-8(SeeNote 1)

−50 (−58) - - - -

US MIL-DTL-83133 JP-8+100(SeeNote 4)

−50 (−58) - - - -

US MIL-T-5616 JP-1 (SeeNote 3)

-60 (-76) - - - -






TABLE 10, Approved Fuels (Cont’d)

ISSUINGAUTHORITY/

BODY

KERO-SENETYPE


WIDE CUTTYPE




British JointServicesDesignation

AVTUR(SeeNote 2)

N/A AVTAG(SeeNote 2)

N/A AVCAT(SeeNote 2)

N/A

AVTUR/FSII(SeeNote 1)

N/A AVTAG/FSII(SeeNote 1)

N/A AVCAT/FSII(SeeNote 1)

N/A

NATO Code F34(SeeNotes 1and 2)

N/A F40(SeeNotes 1and 2)

N/A F43 N/A

F35(SeeNote 2)

N/A - - F44(SeeNotes 1and 2)

N/A

Government:

CanadianGeneralStandardsBoard

CAN/C.G.S.B.3.23

−47 (−53) CAN/C.G.S.B.3.22

−51 (−60) CAN/C.G.S.B.3-GP-24

−46 (−51)

BritishMinistry ofDefence

DEF STAN91-87(SeeNote 1)

−47 (−53) DEF STAN91-88(SeeNote 1)

−58 (−72) DEF STAN91-86(SeeNote 1)

-46 (-51)

DEF STAN91-91

−47 (−53)






TABLE 10, Approved Fuels (Cont’d)

ISSUINGAUTHORITY/

BODY

KERO-SENETYPE


WIDE CUTTYPE




FrenchMinistry ofthe ArmedForces

AIR 3405(SeeNote 1)

−50 (−58) AIR 3407(SeeNote 1)

−58 (−72) AIR 3404(SeeNote 1)

−46 (−51)

Romania:

STAS 3754 Jet A-1 -53 (-63) - - - -

STAS 5639 Jet A-1 −47 (−53) - - - -

Poland:

BN-70/0533-71 ATK -50 (-58) - - - -

China:

RP-3 -47 (-53) - - - -

Russia:

GOST 10227 RT -55 (-67) - - - -

NOTE: 1. Contains fuel system icing inhibitor FSII.

NOTE: 2. These designations are not specifications, therefore there are no freeze pointdefinitions.

NOTE: 3. Although obsolete, this fuel is still refined in some parts of the world.

NOTE: 4. Contains thermal stability improver additive.






E. The list of approved fuels subject to restrictions on use is as follows:

(1) The fuels listed in TABLE 11 are considered by P&WC to be satisfactory foroccasional use only. If these fuels are used in an engine the minimum fuel nozzleperiodic inspection interval must be followed. Continued use of these fuels will bebased on the results of the inspection.

NOTE: Unless otherwise stated, the latest revision of the fuel specifications willapply in TABLE 11.

TABLE 11, Acceptable Fuels Subject to Restricted Use

ISSUINGAUTHORITY/

BODY

KERO-SENETYPE

FREEZEPOINT °C

(°F)WIDE CUT

TYPE

FREEZEPOINT °C

(°F)


FREEZEPOINT °C

(°F)

Russia:

GOST 10227 TS-1 -60(-76) T-2 (SeeNote)

-60(-76) - -

GOST 10227 T-1 -60(-76) - - - -

Bulgaria:

BDS 5075-71 TS-1 -60(-76) T-2 (SeeNote)

-60(-76) - -

BDS 5075-71 T-1 -60(-76) - - - -

Ukraine:

GSTU320.00149943

RT -55(-67) - - - -

GSTU320.00149943

TS-1 -55(-67) - - - -

Poland:

PN-72/C-96026 P-2 -60(-76) - - - -






TABLE 11, Acceptable Fuels Subject to Restricted Use (Cont’d)

ISSUINGAUTHORITY/

BODY

KERO-SENETYPE

FREEZEPOINT °C

(°F)WIDE CUT

TYPE

FREEZEPOINT °C

(°F)


FREEZEPOINT °C

(°F)

PN-72/C-96026 PSM-2 -60(-76) - - - -

NOTE: Use of fuel lubricity improver strongly recommended.






F. The list of alternative fuels is as follows:

(1) The fuels listed in TABLE 12 are considered by P&WC to be satisfactory foralternative use only.


CAUTION: ALTHOUGH DIESEL AND HEATING FUELS ARE CHEMICALLY SIMILARTO JET FUELS, THEIR COLD FLOW, VISCOSITY AND FREEZING POINTCHARACTERISTICS ARE SPECIFICALLY CONTROLLED DURINGREFINING TO A LEVEL GENERALLY NOT SUITABLE FOR USE INAIRCRAFT.

(2) Specifically excluded, as possible alternate or emergency fuels, are such productsas automotive gasoline, diesel fuel, heating fuel or any combination of theseproducts with Jet fuels.

TABLE 12, Alternate Fuels Approved Fuels Subject to Restrictions on Use

Fuel Type ASTM IATAU.S. FederalU.S. Military

CanadianCGSB

Restrictionson Use

Low SulphurDiesel Fuel(CP-43)(Arctic Grade)

D975 No. 1D - - CAN 3.6Type A

Shall not beused below-36.4 °F (-38 °C)ground OAT

AutomotiveDieselFuel (CPW46)(Arctic Grade)

D975 No. 1D - CAN 3.6Type A

Shall not beused below +5°F (-15 °C)ground OAT

Low SulphurDiesel Fuel(CP-48)(Arctic Grade)

-

- - CAN 3.6Type A

Shall not beused below-45.4 °F (-43 °C)ground OAT

AutomotiveDieselFuel (WinterGrade)

- - CAN 3.6Type A

Shall not beused below +20°F (-7 °C)ground OAT

AutomotiveDieselFuel (RegularGrade)

D975 No. 2D - CAN 3.6Type B

Shall not beused below +40°F (+5 °C)ground OAT






TABLE 12, Alternate Fuels Approved Fuels Subject to Restrictions on Use (Cont’d)


CanadianCGSB

Restrictionson Use

NOTE: 1. Unless otherwise specified intermittent or continued use of these fuels for up to 1000hours is allowed provided satisfactory fuel nozzle inspection results are achieved at theapproved intervals.

NOTE: 2. Unless otherwise specified continued use of these fuel for more than 1000 hours isallowed provided periodic fuel nozzle inspection results are found acceptable byP&WC.

NOTE: 3. After the use of diesel fuel containing dyes or Grade 80 aviation gasoline, the fuelsystem must be flushed.

G. The list of emergency fuels is as follows:

CAUTION: ADDITIVES SUCH AS TETRAETHYL LEAD AND PHOSPHORUSCOMPOUNDS, USUALLY COMMON TO GASOLINE FUELS CAN CAUSEDAMAGE TO HOT SECTION PARTS FROM A CORROSION,SULPHIDATION AND METALLURGICAL STRENGTH STANDPOINT.

(1) The fuels listed in TABLE 13 are considered by P&WC to be satisfactory foremergency use only.


TABLE 13, Emergency Fuels Approved Fuels Subject to Restrictions on Use


CanadianCGSB

Restrictionson Use

AviationGasoline(Grades: 80, 100&100 LL)

D910 - CAN 3.25 Shall not beused for morethan 150 hoursduring anyperiod betweenengineoverhauls.

NOTE: 1. After use of Grade 80 aviation gasoline, the fuel system must be flushed.

4. Appendix

Not applicable.





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