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HYD PRESS.
F/D CMDS AVAILABLE FROM ANY FCC NOT CMD ENG
Single Channel Command Engage Block Diagram Figure 10
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(b)
All A/P servos of one channel are powered from that channel's hydraulic system and provide mechanical inputs to the respective flight control actuator.
(c)
Each FCC supplies data to the engine indication and crew alerting system, the A/P DISC (red) warning light, the AUTOPILOT (amber) caution light and the stabilizer trim control system.
(d)
GUN 001-050, 052-999; autoland requires 3 or 2 A/Ps to be CMDENG. Autoland status is indicated on the Autoland Status Annunciator (ASA) as LAND 3 (green), LAND 2 (green), NO LAND 3 (amber), and NO AUTOLND (amber).
(e)
GUN 051; autoland requires 3 or 2 A/Ps to be CMDENG. Autoland status is indicated on the Autoland Status Annunciator (ASA) as AUTOLAND 3 (green), AUTOLAND 2 (white), and MANUAL LND (amber).
(f)
The AFDS status is displayed on the EADIs. Flight director bar commands are not available from a CMDENG channel. The AFDS flight mode annunciation (FMA) display indicates roll and pitch modes that are armed or engaged.
(7) Autoland Categories and Configurations (Fig. 12)
(a) The AFDS is capable of controlling the airplane in Category III approaches, depending on the ground facilities available. A typical arrangement is as follows. 1) The G/S transmitter is approximately 900 feet from the
runway threshold and transmits a beam with a centerline inclined at a minimum of 2 1/2 degrees to the horizontal.
2) The AFDS controls the airplane to touchdown 500 feet beyond the G/S transmitter. Lateral and landing rollout control is guided by the localizer transmitter at the far end of the runway.
(b)
A Category III approach is divided into three sub-categories (A, B, C) according to the runway visual range (RVR).
(c)
GUN 001-050, 052-999; the Fail Operational configuration has three A/P channels hydraulically engaged in roll, pitch, and yaw. All three use independent data and independent electrical and hydraulic power systems. The ASA shows LAND 3 (green).
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CATEGORY AUTOLAND DH RVR
I 200 í1800
II 100 í1200
IIIA 0 í700
IIIB 0 í150
IIIC 0 í0
DH= DECISION HEIGHT
RVR= RUNWAY VISUAL RANGE
Autoland Categories and ConfigurationsFigure 12
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(d)
GUN 051; the Fail Operational configuration has three A/P channels hydraulically engaged in roll, pitch, and yaw. All three use independent data and independent electrical and hydraulic power systems. The ASA shows AUTOLAND 3 (green).
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