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eeMS _PROGRAMCHANGE REQUESTSee

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1.5 COMPLETEDBY ORIGINATORii, ORIGINATOR DATE 1.2 ORGANIZATION APPROVAL OaTeE

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G. Cherry 1/15/69 MIT/IL J tes Cota

ee CRFCCTIVETY bead TITLE GF CHANGE 5

let peieers If3 Improve the Rate-of-descent

ie TS Mode (PSS) Performance

ides RCASON(S) FOR CHANGE

See Datalimplification Sheet

ionsDESCRIPTION OF CHANGE

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PROGRAM CHANGEREQUEST NO.

CONTINUA’

139

Ke Ov

700PREPARED BY: G. Che

ORGABIGATION:.

ELONSECTION (REFER TO BLO

CRA!

Neil Armstrong has mentioned that if the vate-of-descent mode program :

ale

(p55) is entered from P64, P65, or PO7 with a sighsink rate that a- ; aol

very large number of clicks must be enterd with%

she ROD switch.;

Farthermore, some of these clicks seem to get lost. Neil suggested. ~.-+:

that we explore a scaling change which would covmand greater change

then 1 ft/sec/click.:

es

Pete Conrad has mentioned some

simultaneously commanding 2 change in de

“the system seemed to come up with a diff :;

intended and commanded.ee

;

4 :

sronieantSS 266mediate without

5ft/sec descent rave. Tais modification

present scaling, 1ft/sec, for fin ne descent reve adjustment.Another modification being explored is to examine high

- frequencies for measuring descent rate, accounting for inp

and adjusting the thot OT

aeone second, but the program changes the command th ust only once

The optimization ofT, ‘in Fig,‘be undertaken.

:

of 2

APOLLO SPACECRAFT SOFTWARE CONFIGURATION CONTROL BOARD

“DATA AMPLIFICATION SHEET - oe i

PACE-2 OF 2 3%: :

Mrt/IL

ER AND TITLE

EQUEST FORM)CK NUMB

ON PROGRAM CHANGE R

So

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$

0

ct with P66 on the IMS.

r rapidly and -ate via the ROD switch,

rate from the one’.

Les

a

was changing the attitude of

ng Ron@SechictOr

oO3

pes

Design improvements are currently being studied, One design~

9-

Haiecastl

change proposed at MIT which would help with the problem

would be to establish a pad-loaded descen

1 noted. oe

on the first entry

2t/sec,and if the

ec the program, would

throttle to establishace

low us to retain the;

This padrload value could: oSile descending at

swivch elseks ad

al

her sample13 ROD clicks,

manded change

DU)

oyThe'The engine can react to a c

seconds.

uhel5 (page 5.38137) will also

REMARKS

VPH21812

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