in 85 seconds after the TE inboard flaps are retracted. 2) Make sure the PDUs shut off automatically.
(g)
Move the ALTN FLAPS EXT/RET switch to the EXT position for approximately 10 seconds.
(h)
Move the ALTN FLAPS EXT/RET switch to the OFF position.
(i)
Move the ALTN FLAPS ARM switch to the normal position. 1) Make sure the LE flaps move to the retracted position.
S 735-066
(5) Do a test on the alternate motor current draw and relays for electric drive.
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| TABLE I |
........................................................................
| DRIVE | CIRCUIT | LEFT WING | RIGHT WING |
| UNIT | BREAKER .......................................
| AND | ON | RELAY | RELAY |
| SET | P414 AND P415 .......................................
| NO. | PANELS | EXTEND | RETRACT | EXTEND | RETRACT |
........................................................................ | 1 | ALT LE FLAP DRIVE 1 | R361 | R362 | R379 | R380 | ........................................................................ | 2 | ALT LE FLAP DRIVE 2 | R365 | R366 | R375 | R376 | ........................................................................ | 3 | ALT LE FLAP DRIVE 3 | R367 | R368 | R373 | R374 | ........................................................................ | 4 | ALT LE FLAP DRIVE 4 | R369 | R370 | R371 | R372 | 2..........….....................…........….........…........….........1
(a) Prepare for test. 1) On the pilot's center panel, make sure the ALTN FLAPS ARM switch is in the usual position. 2) On the pilot's center panel, make sure the ALTN FLAPS EXT/RET switch is in the OFF position.
3) For the applicable system, Open these circuit breakers and attach DO-NOT-CLOSE tags: a) P6 Main Power Distribution Panel
-6L21 LE FLAP ELEC CONT GRP B DRIVE 1
-6L22 LE FLAP ELEC CONT GRP A DRIVE 2
-6L23 LE FLAP ELEC CONT GRP A DRIVE 3
-6L24 LE FLAP ELEC CONT GRP A DRIVE 4
b) P414 Power Distribution Center - Left
-414A5 LE FLAP ELEC DRIVE 1
-414A2 LE FLAP ELEC DRIVE 4
c) P415 Power Distribution Center - Right
-415M35 LE FLAP ELEC DRIVE 2
-415B32 LE FLAP ELEC DRIVE 3
4) Move the switch on the test box to the NORMAL position. 5) Attach the ground clip from the test box to the ground lug on the P54 panel. 6) Remove the applicable drive relay of the leading edge from
the P54 panel. 7) Install the relay in the test box relay socket. 8) Connect the header from the test box to the relay socket in
the P54 panel. 9) Install the screws.
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747-400 MAINTENANCE MANUAL
10) For the applicable system, Remove the DO-NOT-CLOSE tags and close these circuit breakers: a) P6 Main Power Distribution Panel
-6L21 LE FLAP ELEC CONT GRP B DRIVE 1
-6L22 LE FLAP ELEC CONT GRP A DRIVE 2
-6L23 LE FLAP ELEC CONT GRP A DRIVE 3
-6L24 LE FLAP ELEC CONT GRP A DRIVE 4
b) P414 Power Distribution Center - Left
-415M35 LE FLAP ELEC DRIVE 2
-414A2 LE FLAP ELEC DRIVE 4
c) P415 Power Distribution Center - Right
-415M35 LE FLAP ELEC DRIVE 2
-415B32 LE FLAP ELEC DRIVE 3
11) On the pilots' center panel, push the ALTN FLAPS ARM switch to set the flap system in alternate control. 12) Move the ALTN FLAPS EXT/RET switch to the EXT or RET position.
(b)
Connect the applicable ammeter to the test box for each test.
(c) 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：747-400 AMM 飞机维护手册 飞行操纵 FLIGHT CONTROLS 7(72)
