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BOEING PROPRIETARY - Copyright#Unpublished Work - See title page for details
FLAP POSITION TRANSMITTER - REMOVAL/INSTALLATION
1. General
A. This procedure has these tasks:
(1) A removal of the flap position transmitter
(2) An installation of the flap position transmitter.
B. The flap position transmitters are installed on the outboard end of transmissions No. 1 and 8.
C. The flap position transmitters include additional syncros that are used in the autopilot and the stall
management systems.
TASK 27-58-01-000-801
2. Flap Position Transmitter Removal
(Figure 401)
A. References
Reference Title
27-51-00-040-801 Trailing Edge Flap System Deactivation (P/B 201)
27-51-00-860-803 Extend the Trailing Edge Flaps (P/B 201)
27-51-00-980-801 Trailing Edge Flap System Manual Operation (P/B 201)
27-62-00-800-801 Speed Brake Hydraulic Systems A and B Pressurization (P/B 201)
27-62-00-800-802 Remove Pressure from the Speed Brake Hydraulic Systems A and B
(P/B 201)
B. Location Zones
Zone Area
544 Left Wing - Fairing Flap Support No. 1
644 Right Wing - Fairing Flap Support No. 8
C. Prepare for the Removal
SUBTASK 27-58-01-860-001
(1) Extend the trailing edge flaps to the 40-unit position. To extend them, do this task: Extend the
Trailing Edge Flaps, TASK 27-51-00-860-803.
(2) Do this task: Speed Brake Hydraulic Systems A and B Pressurization,
TASK 27-62-00-800-801
SUBTASK 27-58-01-860-022
(3) Put the SPOILER A and B switches to the OFF position to remove the hydraulic power from the
flight spoilers.
NOTE: SPOILER A and B switches are on the flight control panel (P5-3).
SUBTASK 27-58-01-860-023
(4) Put the speed brake lever in the UP position to lift the spoilers.
SUBTASK 27-58-01-860-024
(5) Do this task: Remove Pressure from the Speed Brake Hydraulic Systems A and B,
TASK 27-62-00-800-802.
SUBTASK 27-58-01-040-001
(6) Do this task: Trailing Edge Flap System Deactivation, TASK 27-51-00-040-801.
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BOEING PROPRIETARY - Copyright#Unpublished Work - See title page for details
D. Flap Position Transmitter Removal
SUBTASK 27-58-01-860-002
(1) For the left flap position transmitter [2] T427, do this step;
Open these circuit breakers and install safety tags:
CAPT Electrical System Panel, P18-1
Row Col Number Name
C 5 C01041 AFCS SYS A SNSR EXC AC
F/O Electrical System Panel, P6-1
Row Col Number Name
B 4 C01207 SMYD-2 SNSR EXC AC
F/O Electrical System Panel, P6-2
Row Col Number Name
A 12 C00213 FC TE FLAP POS/SKEW SNSR & IND LEFT
SUBTASK 27-58-01-860-003
(2) For the right flap position transmitter [2] T428, do this step;
Open these circuit breakers and install safety tags:
CAPT Electrical System Panel, P18-2
Row Col Number Name
E 6 C01205 SMYD-1 SNSR EXC AC
F/O Electrical System Panel, P6-2
Row Col Number Name
A 11 C01443 FC TE FLAP POS/SKEW SNSR & IND RIGHT
C 2 C01042 AFCS SYS B SNSR EXC AC
SUBTASK 27-58-01-980-001
(3) Manually extend the trailing edge flaps until the ballscrew nut [14] touches the downstop [12] on
the ballscrew [13] on transmission No. 4 or No. 5. To manually extend the flaps, do this task:
Trailing Edge Flap System Manual Operation, TASK 27-51-00-980-801.
NOTE: This is the flaps extend overtravel stop position.
SUBTASK 27-58-01-020-001
(4) Disconnect the electrical connector [1] from the flap position transmitter [2].
SUBTASK 27-58-01-020-002
(5) Remove the flap position transmitter [2]:
(a) Remove the bolt [3] and washer [4] and washer [6] that attaches the jumper wire [5] and the
flap position transmitter [2] to the transmission [7].
(b) Remove the bolts [11] and washers [10] that attach the flap position transmitter [2] to the
transmission [7].
(c) Remove the flap position transmitter [2] from the transmission [7].
------------------------- END OF TASK ---------------------------
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BOEING PROPRIETARY - Copyright#Unpublished Work - See title page for details
Flap Position Transmitter Installation
Figure 401 (Sheet 1 of 4)/27-58-01-990-801
737-600/700/800/900
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Flap Position Transmitter Installation
Figure 401 (Sheet 2 of 4)/27-58-01-990-801
　
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