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SPACECRAFT DESCRIPTION

L The Spacecraft for the AS-50_ mission is composed of:

Launch Escape System (LES)

Command Module (CM)

;. Service Module (SM)

Lunar Module (_I)

Spacecraft Lunar Module Adapter (SLA)

Launch Escape S_ste m

The Launch Escape System, which is Jettisoned approximately 35 seconds after

S-II Ignition, is made up of a Launch Escape Tower (LET), and a three-motor pro-

pulsion system (Tower Jettison, Launch Escape and Pitch Control Motors).

; "Command Module

The Command Module is a Block II Configuration. The module's inner struc-

ture, or pressure vessel, is separated fzom the outer structure by a layer of

" insulation. A heat shield structure is made up in three segments consisting of

a forward heat shield, a _rew compartment hea_ shleld_ and an aft shield. The

(24 is slightly over ii feet in length and is about 12 feet in diameter. A"

• propulsiot_ system consists of Reaction Control Engines which may operate pulsed

or continuous.

Service Module

' The Service Module maybe described as a cylindrical, aluminum shell which

• is mad& up of honeycomb-sandwich panels and a forward and aft bulkhead. Oke

gimballed propulsion engine (capable of up to 30 restarts) and a reaction control

system (4 clusters, 4 chambers each) make up the Sl! Propulsion System. The Com-

mand and Service Module are Joined by three tension ties each of which is

equipped with explosive charges for SM/CMseparation.

Lunar Module

The Lunar Module consists primarily of an Ascent and Descent Stage. The

Ascent Stage, which contains the crew compartmettt_ is equipped with a Reaction

Control System which provides thrust capability, an ingress and egress hatch to

the _rew's instrumentation and controls. The Descent Stage_ consists primarily

. of a descen_ engine a,d four retractable landing gear assemblies. Over all

, weight of the Lunar _odule is approximately 30,000 pounds. -"

Spacecraft Lunar Module Adapter

The spacecraft Lunar Module Adapter (SLA) Joins the S_rvlce Module (SM) to

the S-IVB/IU. The SLA encloses th6 Lunar 14odule. Adapter panels which enclose

the Lunar Module are Jettisoned prior to docking and Lunar Module extraction.

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Apollo Saturn Manual do Utilizador Página 83