a) 7F22 Landing Gear Dsp & Cont Pri b) 7F23 Landing Gear Dsp & Cont Altn
(h)
Make sure the Idle bit goes back to 0.
S 714-010-N00
(4)
Make sure the discretes card transmits the correct signal to the Probe Heat bit (Label 270 Bit 28).
(a)
For the applicable engine, add these codes:
~.....................................
| ENG | CH | CODE | PAGE |
.......................................
| 1 | A | E/082/270/00 | 1/2 |
.......................................
| 1 | B | E/090/270/00 | 2/2 |
.......................................
| 2 | A | E/084/270/00 | 1/2 |
.......................................
| 2 | B | E/092/270/00 | 2/2 |
.......................................
| 3 | A | E/083/270/00 | 1/2 |
.......................................
| 3 | B | E/091/270/00 | 2/2 |
.......................................
| 4 | A | E/085/270/00 | 1/2 |
.......................................
| 4 | B | E/093/270/00 | 2/2 |
2......…......…..............…........1
(b)
For the applicable engine, remove the DO-NOT-CLOSE tag and close these circuit breakers: 1) P6 Main Power Distribution Panel
a) 6H19 Probe Heat Engine 1
b) 6H21 Probe Heat Engine 2
c) 6H23 Probe Heat Engine 3
d) 6H25 Probe Heat Engine 4
(c)
Make sure the Probe Heat bit 28 is 0 (fifth bit from the left on the first line).
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
73-21-12
ALL ú ú N01 Page 405 ú Oct 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
CAUTION: DO NOT OPEN THE AIR-GROUND CIRCUIT BREAKERS FOR MORE THAN
_______ 10 SECONDS. WHEN YOU OPEN THESE CIRCUIT BREAKERS, POWER IS SUPPLIED TO THE PT2/TT2 PROBE HEAT. IF THESE CIRCUIT BREAKERS ARE OPEN FOR MORE THAN 10 SECONDS, YOU CAN CAUSE DAMAGE TO THE PT2/TT2 PROBE HEAT.
(d)
Open these circuit breakers for the air-ground mode and attach the DO-NOT-CLOSE tags: 1) P7 Overhead Circuit Breaker panel
a) 7F22 Landing Gear Dsp & Cont Pri b) 7F23 Landing Gear Dsp & Cont Altn
(e)
Make sure the Probe Heat bit goes to 1.
(f)
Remove the DO-NOT-CLOSE tags and close these circuit breakers for the air-ground mode: 1) P7 Overhead Circuit Breaker panel
a) 7F22 Landing Gear Dsp & Cont Pri b) 7F23 Landing Gear Dsp & Cont Altn
(g)
Make sure the Probe Heat bit goes back to 0.
S 864-009-N00
(5) Put the EEC MAINT ENG (1, 2, 3, or 4) POWER switch on the P461 panel top the NORM position.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
73-21-12
ALL ú ú N01 Page 406 ú Oct 10/96
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
EEC THERMOCOUPLE PROBE (TT3) - REMOVAL/INSTALLATION
___________________________________________________
1. General
_______
A. This procedure gives the instructions to remove and install the EEC thermocouple probe (TT3 probe).
B. The TT3 probe is installed on the diffuser/combustor case at the 2:30 o'clock position.
C. You can get access to the TT3 probe through the right thrust reverser.
TASK 73-21-14-004-001-N00
2. Remove the EEC Thermocouple Probe (TT3 probe) (Fig. 401)
_____________________________________________
A. References
(1)
AMM 71-11-04/201, Fan Cowl Panels
(2)
AMM 71-11-06/201, Core Cowl Panels
(3)
AMM 78-31-00/201, Thrust Reverser System
B.
Access
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本文鏈接地址：747-400 AMM 飛機(jī)維護(hù)手冊(cè) 發(fā)動(dòng)機(jī)燃油和控制 2(76)
