LEADING EDGE FLAP AND SLAT PROXIMITY SENSORS - REMOVAL/INSTALLATION
1. Prepare Proximity Sensors for Removal
A. Pressurize hydraulic system A. Refer to 27-81-0, Leading Edge Flaps and Slats - Maintenance Practices.
B. Position flap control lever to 1-unit detent.
C. Tag flap control lever to prevent unexpected movement of the leading edge devices.
D. Depressurize hydraulic systems. Refer to 27-81-0.
E. Remove access panels to gain access to slat proximity sensors.
2. Remove Proximity Sensors
A. Remove screws attaching bracket to leading edge structure. (See figures 401 and 402.)
B. Disconnect wiring at splice. (Splice is located within 4 feet of sensor.)
C. Remove bolts attaching proximity sensor to bracket and separate sensor from bracket.
3. Install Proximity Sensors
A. Secure proximity sensor to mounting bracket.
B With leading edge devices at intermediate extend position, loosely install proximity sensors at locations shown in figures 401 and 402 and adjust sensors as follows:
(1)
On leading edge slats, adjust sensor to maintain gap of 0.08 (+ 0.02) inch between sensor and adjacent actuation bar.
(2)
On Krueger flaps, adjust gap between sensor and adjacent actuation bar as follows:
(a)
Pressurize hydraulic system A. Refer to 27-81-0.
(b)
Cycle flaps several times to allow upper flap nose rod (figure 402) to center on its self-aligning bearings
(c)
Depressurize hydraulic systems. Refer to 27-81-0
(d)
Without disturbing the upper flap nose rod, maintain gap of 0.16 (+ 0.01) inch between flap extend sensor and actuation bar.
(e)
At flap retract sensor (figure 402), maintain gap of 0.08 (+ 0.02) inch between sensor and actuation bar.
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Feb 15/73 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 27-88-11 Page 401
NOTE: To obtain the preceding gap it may be necessary to apply putty to the flap retract sensor, pressurize hydraulic system A and then slowly retract the flaps. After extending the flaps again, depressurize hydraulic system A and check the gap by measuring the thickness of putty remaining on the flap retract sensor.
(3)
Pressurize hydraulic system A. Refer to 27-81-0.
(4)
Position flap control lever to FLAP DOWN detent.
(5)
Depressurize hydraulic systems. Refer to 27-81-0.
(6)
Tag flap control lever to prevent unexpected movement of the leading edge devices.
C. Match color coded wires and splice. Retie wire bundles and ensure wires are properly routed through clamps.
D. Test proximity sensors. Refer to Leading Edge Flap and Slat Proximity Sensors -Adjustment/Test.
4. Restore Airplane to Normal Configuration
A. Pressurize hydraulic system A. Refer to 27-81-0.
B. Position flap control lever to FLAP UP to retract flaps.
C. Depressurize hydraulic systems. Refer to 27-81-0.
D Remove tag from flap control lever.
E. Install access panels.
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G43070 G43074G43086 G43092G43094
531 Leading Edge Slat Proximity Sensor Installation
May 15/71 Figure 401 (Sheet 1) 27-88-11
Page 403
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
Leading Edge Slat Proximity Sensor Installation 521
27-88-11 Figure 401 (Sheet 2) May 15/71
Page 404
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
521 Leading Edge Slat Proximity Sensor Installation
May 15/71 Figure 401 (Sheet 3) 27-88-11
Page 405
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
Leading Edge Slat Proximity Sensor Installation 521
27-88-11 Figure 401 (Sheet 4) May 15/71
Page 406
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
521 Leading Edge Flap Proximity Sensor Installation
May 15/71 Figure 402 27-88-11
Page 407
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
LEADING EDGE FLAP AND SLAT PROXIMITY SENSORS - ADJUSTMENT/TEST
1. Leading Edge Flap and Slat Proximity Sensors Test
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