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2)
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757
MAINTENANCE MANUAL
Customer Option Pin 1 (pin P1B-A12 grounded) and, Customer
Option Pin 2 (pin P1B-B12 grounded) - When these pins are
grounded, the -105 FCC cannot be used with subsequent dash
number FCCs. The functions listed for Customer Option Pin
1 are still applicable. Also, the Customer Option Pin 2
includes these functions:
a) CHANGED BACKCOURSE (BCRS) MODE LOGIC: Mode logic is changed to permit a change from the flight director takeoff mode directly to the flight director BCRS mode. This will make BCRS departures easier at airports where it is necessary to use these procedures.
b) NUISANCE GLIDESLOPE ANOMALY TRIPPING DECREASED: The delay on the glideslope anomaly detector annunciation is increased from 10 seconds to 15 seconds to decrease the risk of nuisance glideslope beam error fault indications. Also, the glideslope anomaly detector is disconnected for flight director only approaches.
c) CHANGE F/D AUTO-ON LOGIC: The F/D auto on feature is prevented below 80 knots indicated airspeed.
d) RUDDER VALVE TEST PREVENTED FOR ENGINE-OUT: The rudder valve test is prevented if one engine has failed before approach to prevent nuisance NO LAND 3 annunciations because of rudder trim.
e) CHANGED STABILIZER TRIM LOGIC: Nose up stabilizer mistrim at 330 feet AGL is prevented during LAND 3 operation.
f) CHANGED HEADING SELECT LOGIC: The heading select logic is changed to prevent a wrong-way turn flight director command after a go-around.
g) CHANGED MULTI-CHANNEL A/P ENGAGE LOGIC: Multi-channel autopilot engagement is prevented if there is an autopilot caution. This will prevent LAND 3 annunciation with the glideslope anomaly detector open.
h) CHANGED ADC SELECT LOGIC: A latch delay is added to the Air Data Computer (ADC) select logic prevent inadvertent transfers to cross-channel ADC inputs.
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A
757 MAINTENANCE MANUAL
3) The three remaining pins are provided for selecting customer unique configurations which are currently undefined.
(e) FCC Option 2 1) A/P Mode Engage (Pin P1B-A3 grounded) - When the autopilot is initially engaged in command (CMD) mode, the autopilot will engage, with exception of Takeoff or Go-Around modes, into the current flight director modes. If the flight directors were initially OFF or the original flight director modes were Takeoff or Go-Around, the modes will become Vertical Speed(pitch) and Heading Hold (roll). Glideslope and localizer active modes will transition to Heading Hold and Vertical Speed modes, and the glideslope and localizer will be rearmed. 2) Autopilot Disengage Warning, Double/Single Push Reset a) Whenever an A/P disengage warning occurs due to a control wheel disconnect switch action, the warning reset procedure depends on grounding of the option pin. b) Double Push Reset (P1B-H13 open) - If the autopilot warning light is on due to an autopilot disconnect from the wheel disconnect switch, the control wheel A/P disengage switch must be pressed and released a second time to reset the warning. c) Single Push Option (P1B-H13 grounded) - The autopilot disconnect warning is reset automatically after 2 seconds. d) Reset of the autopilot disconnect warning due to any other means of disconnect is achieved by pressing and releasing either control wheel A/P disengage switch. The warning continues until the switch is released. 3) Full-Time No Land 3 Option a) This option controls the display capability of each ASA. b) Baseline configuration: (P1B-K13 open) The autoland capability is not displayed until the Approach (APP) mode is operative.
c) Option: (P1B-K13 grounded) The autoland capability is displayed full-time. 4) Method 1/Method 2 Approach Mode Channel Selection a) At the selection of the APP mode, this option determines how off-line A/P channels are armed.
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