Apollo Saturn Manual do Utilizador descarregar pdf (Página 30)

SPACECRAFT BACKUP GUIDANCE AND CO;;TROL/F_M,_IAI,ATTITUDE COi_"I';<OLCAPABILITY

The Launch Vehicle Flight Control Computer will accept attitude commands

from the spacecraft instead of the LVDC during (i) boost to Earth Parking

Orbit (EPO); (2) orbital coast mode; (3) TransJunar Injection (TLI) burn; and

(4) tile post TLI coast mode, with the follow_ng constraints"

, DurinK Burn Modes

, .. The Spacecraft attitude commands wiil be accepted by the flight

control computer only in the event that the LVDA signals that the LV ST-124M

: Platform has failed followed bv the Astronaut enabling the LV Guidance Switch.

If the ST-124M Platform should fail before Time Base 6 (TB6) !nitiation, a

navigation update by ground command will be required to start TB6 (S-IVB preps.

: and second burn). There are two modes to the backup system operations and they

: a)Fe :

: (i) Automatic Backup Guidance and Control

i ,

In the automatic guidance mode both the control and guidance

functions will be provided by the Spacecraft. This backup mode is used during

S-IC stage flight and S-II flight up to LET jettison. The sequence of events

are as follows:

a. Failure of ST-124M is verified by LVDA.

, b. LVDA illuminates warnin_ light in S/C.

c. Astronaut enables LV Guidance switch.

-_ d. S/C transmits error signals to LV flight control computer.

, (2) Manual Backup Guidance and Control

_ : In the manual guidance mode both guidance and control loops

will be elose¢' through the Astronauts. ._m Astronaut cont_ auously adjusts

i _ vehicle attituCe via the Rotation hand Controller to maintain the desired tra-

Jectory. Sequence of events following a Platform failure after LET Jettison

are:

a. Failure of ST-124M verified by LVDA.

b. LVDA illuminates warning light ia S/C.

' c. Astronaut enables LV Guidance Switch.

.. d. Manual guidance and control is initiated by the Astronaut

enterlnK a word into the S/C computer to switch AUTO/

MANUAL switches to _[ANUAL.

" e. If automatic backup guidance is in operation at LET Jettison,

switching to manual backup is accomplished by performing step

• (d).

During Orbital and Post TLI Coast Mcdes

L In earth orbit ana post TLI coast mode8 the Astronauts have a manual

' attitude control capability. The takeover follows somewhat the procedure for

Manual Backup Guidance and Control takeover.

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Apollo Saturn Manual do Utilizador Página 30

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