Introduction of the mrh90 helicopter and top owl helmet for operational use by the royal australian...
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Transcript of Introduction of the mrh90 helicopter and top owl helmet for operational use by the royal australian...
Headquarters Fleet Air Arm
MRH90 and TopOwl Navy Flight Trials
2010 AMMA/JHC Symposium
DR Glenn PascoeDR Glenn PascoeMBBS, FRACGP, DAvMedMBBS, FRACGP, DAvMed
Senior Medical Advisor Aviation Medicine Senior Medical Advisor Aviation Medicine –– NavyNavy
(Wing Commander, RAAFSR)(Wing Commander, RAAFSR)
AcknowledgmentLCDR Brad MacKayChief of Flight Test, AMAFTU
Headquarters Fleet Air Arm
Headquarters Fleet Air Arm
• TopOwl Helmet
•AMAFTU MRH90 FOCFT
Scope
MRH90• NHIndustries NH90
– Tactical Transport Helicopter (TTH) vs NATO Frigate Helicopter (NFH)
• Troop lift (embarked and land based)• Fly by wire, retractable U/C, • Glass and carbon fibre composites• MTOW > SK50 • Rear loading ramp • Manual fold blades and tail pylon
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Aircraft Maintenance and Flight Trials Unit
• AMAFTU– develop aircraft modifications – maintenance and operational procedures – evaluate through flight test new and
modified configurations, procedures and equipment
– ADF’s centre of expertise for ship/helicopter First of Class Flight Trials (FOCFT),
– Ship/Helicopter dynamic interface assessments (Embarked Flight Trials)
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FOCFT Test – What is it?
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• Where the suitability of the ship / aircraft combination is assessed.
• Ship just as much as aircraft focused• Outputs not only limited to SHOL
– Maintenance & support facilities just as important
• Testing to define safe operational capability of ship / aircraft combination
TopOwl helmet mounted sight and display system
• Valid engineering trade-offs:– Good: See through capability, mass, CG, – Bad: Hyperstereopsis, lower performance
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Headquarters Fleet Air Arm
Binocular Cues for Depth perception
• Stereopsis - Angle of disparity
• Accommodation
• Convergence
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Hyperstereopsis
• An illusion created when each eye views an image from sensors with an interpupillary distance greater than that of the human eyes
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Hyperstereopsis - Effects
• Absolute distance perception– Objects appear closer
Right I² Tube
Target pointReal
distance of object
in the scene
I² tube optical axes
Left I² Tube
D
Normal IPD
DD
Perceived distance of object
in the scene
• Magnification of depth – objects appear stretched, out of shape
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Hyperstereopsis - Effects
• Overlapping objects – If enough light to see object unaided, NVD
image will be over-layed on real world image
– May see three objects instead of one
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Other TopOwl issues
• Colour vision– ADF allows for slightly colour
defective aircrew applicants (CP2)– Optics of the TopOwl visor results
in effectively looking through a “green blocker” when visor is down
– Will CP2 pilots be safe?– Is reflected wavelength band
narrow enough to not be a problem?
– What about LED lights?
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Other TopOwl issues
TopOwl and deck operations
• Compensation for visual distortion is necessary on initial exposure– Adaptation to absolute distance perception
occurs fairly rapidly (5hrs initially then 10- 20mins for re-adaptation)
– Adaptation to magnification of depth (‘arm stretch’ or slope perception) not complete
• USMC concluded that use of Top Owl was unacceptable for deck operations – Different aircraft
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Results of Testing – TopOwl
• AS350 trial: approximately 60hrs– Seated height appeared slightly lower than
normal– Different ‘apparent’ seated height unaided/aided:– Transition from aided to unaided flight
Unsatisfactory
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Results of MRH90 Testing – TopOwl
• MRH90 trial: approximately 10hrs work-up and 10 hrs at sea– Adaptation was Satisfactory
• Misjudged distance mitigated– Normal wheeled a/c landing technique
• Establish ROD during quiescent period and land firmly
– Height estimation assisted by RADALT– ACMN wearing ANVIS-9 NVD– Unfamiliar objects appear closer
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Results of MRH90 Testing – TopOwl
• Peripheral Cues– Enhancing feature– Allows peripheral scanning of a lit deck
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FOCFT–Specifics of Flight Test
• Instrumentation• Deck Modelling
– deck motion limits with/without lashings
• Shore based testing– Initial TopOwl NVD flight testing in AS350– Low speed handling/ data collection– Simulated deck operations
• Sea Testing– Interface Testing– SHOL development
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FOCFT – Specifics of Interface Testing
• Deck interface & facilities examples– Ranging & stowing aircraft– Folding / spreading– Maintenance & support facilities– Hanger suitability– Maintenance supervision– Aircrew briefing / mission planning– Weapons prep / loading aspects– Ship-based aviation facilities
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Results of MRH90 FOCFT
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• 18 days at sea• 19 Test Sorties• 252 Deck Landings (172 Day / 80 Night)• 36 Utility operations• Overall, Very Large Envelopes (SHOLs)• 4 Major deficiencies identified