Apollo Saturn Bedienungsanleitung PDF herunterladen (Seite 77)

INSTgUHENT UNIT

The Instrument Unit is a cylindrical s'tructt_rc arproximately 260 inches in

diteter and 56 inches high which is attached to the forward end of the S-IVB

• stage. IU s_ructure is composed of an aluminum alloy honeycv_b sandwich material

which was selected fo_ its high strength-to-weight ratio, acoustical insulation,

and thermal condmcclvity properties.

The cylinder is composed of three 120 degree segments--the access door J

! segment, the flight control computer segment, and the ST-124-H segment°

'/he IU Stage contains:

Guidance, Navigation and Control Equipment

Telemetry Systems

Tracking Systems

Crew Safety Systems

Envlronmental Control System

The guidance_ navigation and control equipmen t contained in the IU includes

that. which is necessary for _ehicle gu._dance and control during boost through

or_,Ital coast and subsequently for translunar injection.

Telemetry along with measuring systems is used to monitor certain conditions

and events which take place in the IU and to _rans_it these monitored signals to

ground receiving stations,

Tracking _yst__ms assist in the determination of the vehicle's trajectory.

Tracking data is used for mission control, range safety and post flight evalua-

tion of vehicle performance.

Crew Safety is provided by the Emergency Detection Systcm_ a portion of which

is located in the IU stage. EDS senses conditions in the vehicle during boost

phase which could cause vehicle failure.

_nvironmental Control maintains an acceptable o._tating environment during

preflight Ind flight operations.

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Apollo Saturn Bedienungsanleitung Seite 77