PRI LVR UP ALT LVR UP
PRI LBG TILT ALT LBG TILT
PRI LWG TILT ALT LWG TILT
PRI RWG TILT ALT RWG TILT
PRI RBG TILT ALT RBG TILT
PRI NG COMPRESSED
ALT NG COMPRESSED
NO HYD PRESS 1 MSG
NO HYD PRESS 4 MSG
GEAR TILT
GEAR TILT
EIU Message Logic
Figure 4 (Sheet 1)
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PRI LBG DOOR OPEN
ALT LBG DOOR OPEN
PRI LWG DOOR OPEN
ALT LWG DOOR OPEN
PRI NG DOOR OPEN
ALT NG DOOR OPEN
PRI RWG DOOR OPEN
ALT RWG DOOR OPEN
PRI RBG DOOR OPEN
ALT RBG DOOR OPEN
GEAR DOOR
GEAR DOOR
PRI RBG L LK ALT RBG L LK
PRI RBG R LK ALT RBG R LK
PRI LBG R LK ALT LBG R LK
PRI LBG L LK ALT LBG L LK
BG STRG PRES L
BG STRG PRES R
BG STR ARM SW BODY GEAR STRG
BODY GEAR STEERING
EIU Message Logic
Figure 4 (Sheet 2)
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PRI A/G MODE PRI A/G MODE
BATT SW OFF AC BUS NOT POWERED
PRI NG NOT COMP PRI NG NOT COMP
BATT SW OFF AC BUS NOT POWERED
INVALID PSEU BUS DATA 10 SEC TIME DELAY
GEAR MONITOR
60 SEC TIME DELAY
GEAR MONITOR
EIU Message Logic
Figure 4 (Sheet 3)
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(e) The A/G DISAGREE message tells that:
-The primary and alternate air/ground logic outputs from the PSEU do not agree with the wing and/or body gear tilt signals.
(f) The NOSE A/G DISAGREE message tells that:
-The primary and alternate nose gear squat logic states do not agree.
(g) The GEAR MONITOR message tells that:
-
The primary and alternate sensor outputs of a gear do not agree
-
The primary PSEU power bus failed
-Selected sensor inputs to the PSEU have failed
-
Maintenance messages have been supplied.
D.
Control - Air/Ground Relays
(1)
The air/ground relays operate automatically and have no controls.
E.
Control - PSEU
(1)
Turn on procedure
(a)
Apply electrical power (Ref 24-22-00/201).
(b)
Make sure that circuit breakers are closed as follows:
1) P7 Overhead Circuit Breaker Panel a) LANDING GEAR DSP & CONT PRI b) LANDING GEAR DSP & CONT ALTN c) PSEU SECT 1 d) PSEU SECT 2 e) GND SAFETY RELAY
(2)
Turn off procedure
(a)
Open circuit breakers as follows:
1) P7 Overhead Circuit Breaker Panel a) LANDING GEAR DSP & CONT PRI b) LANDING GEAR DSP & CONT ALTN c) PSEU SECT 1 d) PSEU SECT 2 e) GND SAFETY RELAY
(b)
Remove the electrical power (Ref 24-22-00/201).
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LANDING GEAR MULTIPLE SYSTEM/COMPONENTS 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 起落架 LANDING GEAR 1(48)
