A. Description
(1)
This task is for this observed fault:
(a) Tilt Code of ‘‘-5’’ Autothrottle -Left or Right.
(2)
No thrust data is detected from the autothrottle microswitches by the weather radar receiver/ transmitter.
B. Possible Causes
(1)
Wiring.
(2)
Autothrottle microswitch assembly, M1766 (left) or M1767 (right).
(3)
Weather radar receiver/transmitter, M101.
SIL 014, 015, 020
(4) Left (Right) Weather radar receiver/transmitter, M101 (M460).
SIL ALL
C. Circuit Breakers
(1) These are the primary circuit breakers related to the fault:
CAPT Electrical System Panel, P18-3
Row Col Number Name
SIL 014, 015, 020
C 7 C01678 WEATHER RADAR RT RIGHT
F/O Electrical System Panel, P6-1
Row Col Number Name
SIL ALL
D 13 C00120 WEATHER RADAR RT
F/O Electrical System Panel, P6-3 Row Col Number Name A 18 C00583 LANDING GEAR AUTOBRAKE BITE CONT 1
D. Related Data
(1)
(SSM 34-41-11).
(2)
(WDM 34-41-11).
E. Fault Isolation Procedure
(1) Do this check of the wiring between the weather radar receiver/transmitter and the autothrottle microswitch assembly:
(a)
Remove the weather radar receiver/transmitter, M101. To remove it, do this task: Weather Radar Receiver/Transmitter Removal, AMM TASK 34-43-41-000-801.
(b)
Disconnect the left and right autothrottle microswitch, M1766 (M1767). To disconnect it, do this task: Switch Removal, AMM TASK 76-11-07-020-801-F00.
(c)
Do a wiring check between these pins on connector D189B for the weather radar receiver/ transmitter, in the forward equipment center, and connector D11128 (left) and D11132 (right) for the autothrottle microswitch assembly at switch pack #1 and #2 (WDM 34-41-11).
(d)
If you find a problem with the wiring, then do these steps: 1) Repair the wiring. 2) Re-install the weather radar receiver/transmitter, M101. To install it, do this task:
EFFECTIVITY SIL ALL 34-43 TASK 817
D633A103-SIL BOEING PROPRIETARY -Copyright # Unpublished Work -See title page for details Page 254 Feb 15/2011
LEFT AUTO D189B D11128
THROTTLE
pin B9 ------------------ pin 18
RIGHT AUTO D189B D11132
THROTTLE
pin B10 ----------------- pin 18
Weather Radar Receiver/Transmitter Installation, AMM TASK 34-43-41-400-801. 3) Re-install the left and right autothrottle microswitch, M1766 (M1767). To connect it, do this task: Switch Installation, AMM TASK 76-11-07-400-801-F00. 4) Do this task: Weather Radar (WXR) System -Operational Test, AMM
TASK 34-43-00-710-802-001 or Weather Radar (WXR) System -Operational Test,
AMM TASK 34-43-00-710-803-002.
a) If the weather radar operational test passes, then you corrected the fault.
(e) If you do not find a problem with the wiring, then continue.
1) Re-install the weather radar receiver/transmitter, M101. To install it, do this task: Weather Radar Receiver/Transmitter Installation, AMM TASK 34-43-41-400-801.
2) Re-connect the left and right autothrottle microswitch, M1766 (M1767). To connect it, do this task: Switch Installation, AMM TASK 76-11-07-400-801-F00.
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