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757 MAINTENANCE MANUAL
b) GUN 001-050, 052-999; Method 1: (P1B-G13 open) All off-line channels automatically arm for multichannel operation and dot-bar matrices on the CMD ENGAGE switch/lights illuminate.
c) GUN 051; Method 2: (P1B-G13 grounded) Multichannel arm requires that each engage lever be placed in CMD.
d) GUN 001-050, 052-999; Method 2: (P1B-G13 grounded) Multichannel arm requires that each CMD ENGAGE switch/light be individually pressed.
5) GUN 051; optional Autoland Status Annunciator (ASA) option (P1B-C8 grounded) permits use of an alternate type of ASA. The two types of ASAs are functionally equivalent. The alternate type uses different nomenclature on the panel face and prisms (STATUS, AUTOLAND 3, AUTOLAND 2, MANUAL LND).
6) Lateral Command Engage Option (LCEO)
a) When the A/P is initially engaged in CMD or a F/D is turned on, the roll channel response depends upon this option.
b) Baseline configuration: (P1B-C10 open) When the A/P is engaged in CMD, the airplane is rolled to wings level and the A/P engages into HDG HOLD mode regardless of the bank angle (B/A).
c) Option: (P1B-C10 grounded) If the B/A is less than 5 degrees, A/P action is the same as in the baseline configuration. If the B/A is between 5 and 30 degrees at CMDENG, the A/P engages into Roll Attitude Hold. When the B/A is greater than 30 degrees at CMDENG, the A/P rolls the airplane back to 30 degrees and then engages into Roll Attitude Hold.
(f) FCC Option 3 1) CWS Inhibit Option a) This option controls whether control wheel steering function is available.
b) Baseline Configuration: With the option pin not grounded, control wheel steering function is active.
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757 MAINTENANCE MANUAL
c) Option: With the option pin grounded, control wheel steering function is inhibited. The force transducers required for CWS are not installed when option pin is grounded.
2) Full Time Flight Director Option a) This option controls the F/D command displays of each EADI.
b) Baseline configuration: The F/D command bars can only be displayed in the F/D mode. The CMD ENG and MCHENG (multi-channel engage) modes bias the F/D bars from view.
c) Option: The F/D command bars are displayed in the F/D, CMD ENG, or MCHENG modes full-time prior to touchdown. 3) Flight Director Automatic On Option
a) Flight director engage requests will be automatically generated by the FCC's in the go-around mode. This option supports windshear capabilities.
4) Flight Director Display on Rollout Option a) When the A/P is in MCHENG and in the ROLLOUT mode, F/D command bar display depends upon this option. b) Baseline configuration: The F/D command bar display is biased from view during rollout.
(g)
Two pin connections of the shelf identify the FCC as L, C, or R channel. The binary code used is shown in the table of Figure
10.
(h)
The parity pin provides odd parity for the total of program pin ground connections to meet ARINC 429 standards.
2. Component Details_________________
A. The flight control computer, AFCS mode control panel, AFDS go-around switch and A/P disconnect switch are described in Autopilot/Flight Director Power - Description and Operation (22-11-00).
B. The autopilot pitch control servos and elevator neutral shift transducers are described in Autopilot/Flight Director Pitch Channel - Description and Operation (22-12-00).
C. The autopilot rollout guidance servos and autopilot lateral control servos are described in Autopilot/Flight Director Roll and Yaw Channel -Description and Operation (22-13-00).
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