27-51-00
ALL ú ú 01 Page 509 ú Feb 10/91
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
S 865-019
WARNING:_______ MAKE SURE THAT PERSONS AND EQUIPMENT ARE CLEAR OF THE LE AND TE
FLAPS AND FLAP DRIVE MECHANISMS BEFORE YOU MOVE THE FLAP
CONTROL LEVER. WITH HYDRAULIC OR PNEUMATIC POWER REMOVED, THE
TE OR LE FLAPS WILL MOVE AUTOMATICALLY BY ELECTRICAL POWER WHEN
YOU MOVE THE FLAP CONTROL LEVER.
(4)
Move the flap control lever to the 30-unit detent and let the TE flaps fully extend.
(a)
Monitor the position of the TE flaps on the EICAS.
S 735-020
(5)
Make sure that the load relief system operates with the TE flaps at the 30-unit position:
(a)
Increase the airspeed from 0 knots. Increase the airspeed slowly after it is 170 knots.
(b)
Make sure that the TE flaps retract to 25 units at an airspeed of 178 +/-2 knots.
(c)
Make sure the EICAS message FLAP RELIEF shows.
(d)
Slowly decrease the airspeed.
(e)
Make sure that the TE flaps extend to 30 units at an airspeed of 170 +/-2 knots.
S 735-021
(6)
Make sure that the load relief system operates with the TE flaps at the 25 unit position:
(a)
Move the flap control lever to the 25-unit detent and let the TE flaps move to the 25-unit position.
(b)
Slowly increase the airspeed.
(c)
Make sure that the TE flaps retract to 20 units at an airspeed of 203 +/-2 knots.
(d)
Slowly decrease the airspeed.
(e)
Make sure that the TE flaps extend to 25 units at an airspeed of 195 +/-2 knots.
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27-51-00
ALL ú ú 01 Page 510 ú Jun 10/95
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
S 865-022
(7)
Move the flap control lever to the UP detent to fully retract the flaps.
S 865-023
(8)
Do this task to depressurize hydraulic systems No. 1 and 4: "Hydraulic System Depressurization" (Ref 29-11-00/201).
S 865-024
(9)
Do this task to decrease the airspeed to 0 and remove the pitot pressure source: "Pressurization" (Ref 34-11-00/201).
S 865-025
(10)
Do this task: "Remove Electrical Power" (Ref/24-22-00/201).
TASK 27-51-00-745-028
4. Ground Test - Flap Control Units________________________________
A. General
(1)
This is a test of the BITE functions of the flap control units (FCU's). This procedure is applicable to each of the three FCU's. During this test all internal functions of the applicable FCU are tested. Other high lift system LRU faults will also be reported to the FCU. You must not use this test to troubleshoot any high lift component other than the FCU's.
B.
References
(1)
24-22-00/201, Manual Control
C.
Access
(1)
Location Zone
221 Control Cabin, LH
222 Control Cabin, RH
D.
Prepare for the Test
(1)
Supply electrical power (Ref 24-22-00/201).
S 865-040
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
27-51-00
ALL ú ú 01 Page 511 ú Oct 10/95
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
S 865-042
(2)
Make sure the ALTN FLAPS ARM switch is off.
S 865-030
(3)
Prepare the CDU for the test:
(a)
Push the MENU key on the CDU to show the MENU.
(b)
Push the line select key (LSK) that is adjacent to <CMC to show the CMC MENU.
(c)
If <RETURN shows after you push the LSK, push the LSK that is adjacent to <RETURN until you see the CMC MENU.
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