Guidance and Control System

Command Module Guidance and Control System

The Guidance and Control System consisted of a number of sub-systems for in-flight navigation and guidance.

This article gives a high-level overview of the sub-systems: detailed information use will be on individual pages for those systems.

Primary Guidance, Navigation and Control System (PGNCS)

PGNCS components

Stabilisation and Control System (SCS)

SCS components

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Orbital Rate Display Earth And Lunar

ORDEAL

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In normal use the Flight Director Attitude Indicator displays would show the inertial attitude relative to distant stars. This was useful in free space, but when in orbit the pilot may want to see the spacecraft's attitude relative to the surface of the Earth or Moon.

The Orbital Rate Display Earth And Lunar (ORDEAL) was a simple system which could be configured to rotate the FDAIs appropriately so that they would display the attitude relative to the surface instead.

Entry Monitoring System

EMS

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The Entry Monitoring System is used by the crew to monitor the entry trajectory flown by the PGNCS and allows the pilot to fly a manual re-entry if required.

The main EMS panel includes a velocity/load-factor display, range-to-go display, 0.05g indicator and roll/attitude indicator.

External Links

• Apollo experience report: Command and service module reaction control systems
• Apollo experience report: Guidance and control systems
• Apollo experience report: Guidance and control systems - Digital autopilot design development
• Apollo experience report: Lunar module landing radar and rendezvous radar
• Apollo experience report: Lunar module reaction control system
• Apollo Training: Guidance and Control Systems

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