LDG WARNL ENG IDLE MASTER WARNINGLDG THR
MASTER WARN LEFT THRUST SLATS UP
LEVER POSITION SW
NOT
LDG AURAL
WARNWING FSEU 2
CLEAN
SLATS NOT UP
R ENG IDLE L SIREN/OWLLDG THR
AURAL
RIGHT THRUST
LDG AURAL
WARNING
LEVER POSITION SW
WARN
SPOILERS
EXTENDEDSPEEDBRAKE CAUTION AND
SPOILER
MICROSW PACK R SIREN/OWL
HANDLE POS EICAS LEVEL B MSG
AUTOTHROTTLE ASSY
(AISLE STAND) SPLR CONT 2L FLAPS NOT UP
MASTERDIM &LDG FLAPS
FLAPS UPTEST
AA
FLAPS
LDG POS SPEED BRAKE LIGHT
FSEU 1 RESET NO MASTER RESET
1TEST GOOD IF TEST ACTIVE ANDCAPT MSTR WRN
RA DATA VALID AND INTERNAL& CTN LT/SW
MEMORY SUM CHECK GOOD SOFTWAREHARDWARE
2 A 1/2 SECOND DELAY IS APPLIEDBEFORE THE WARNING IS ISSUED
LANDING CONFIGURATION WARNING
UPON LOSS OF "ALL GEAR DN AND
RESET LOCKED" DISCRETE
Landing Configuration Warning Schematic
Figure 8
ú
31-51-00
ALL ú ú 02 Page 20 ú Jan 28/02
A
2)
3)
4)
5)
757 MAINTENANCE MANUAL
b) red CONFIG light c) siren aural warning d) level A EICAS message GEAR NOT DOWNBoth left and right thrust levers are set to idle and the radio altitude is below 800 feet: a) red master WARNING lights b) red CONFIG light c) siren aural warning d) level A EICAS message GEAR NOT DOWNEither left or right thrust lever is set to idle, the radio altitude is below 800 feet, and the time delay as noted below has expired: a) red master WARNING lights b) red CONFIG light c) siren aural warning d) level A EICAS message GEAR NOT DOWN
NOTE: A one time delay of 140 seconds is triggered by
____ the edge of the landing-gear-up transition pulse. This delay allows the airplane to reach an altitude of greater than 800 feet and prevents a warning if only one engine is throttled back at takeoff or go.around. If either 140 seconds have elapsed or the airplane has exceeded 800 feet altitude, the system reverts back to providing a warning from a single engine throttle back.
A radio altimeter failure exists and either thrust lever is set to the idle position: a) red CONFIG light b) level A EICAS message GEAR NOT DOWNA radio altimeter failure exists, either left or right thrust lever is set to idle, and either the flaps or slats are not fully retracted (NOT CLEAN WING): a) red master WARNING b) siren aural warning
ú
31-51-00
ALL ú ú 02 Page 21 ú Sep 20/96
(e)
(f)
(g)
(h)
(i)
(j)
A
757 MAINTENANCE MANUAL
c) level A EICAS message GEAR NOT DOWNThe microprocessor switching output circuits provides a ground signal to turn on the CONFIG warning light. It also provides ground signals to the master warning module for the master WARNING light, to the siren/owl aural warning module for the siren aural, and to the EICAS computers for the EICAS message GEAR NOT DOWN.Pressing either master WARNING light will close the reset switch and inhibit some output signals from the microprocessor switching circuits. This reset will always cancel the master WARNING lights. It will inhibit all aural warnings with the exception of the configuration of landing flaps and gear not down and locked. The CONFIG light and EICAS message GEAR NOT DOWN will remain on until the improper configuration is corrected.The landing configuration aural warning may also be cancelled by pressing the GND PROX/CONFIG GEAR OVRD switch on the P1 panel. This is a L/R siren/owl aural warning module function (Fig. 6).A landing configuration warning test is initiated by means of the CONFIG T/O - LDG test switch on the miscellaneous test panel. Setting the test switch to LDG position provides a logic 0 discrete signal to the microprocessor. This initiates a circuit check and generates the siren aural warning and display of the master WARNING lights, CONFIG light, and level A EICAS message GEAR NOT DOWN.The speedbrake warning is generated by the landing configuration warning module in either of the following conditions: 1) RA >15 feet and speedbrake lever is above the trip point
中国航空网 www.aero.cn
航空翻译 www.aviation.cn
本文链接地址：757 AMM 飞机维护手册 仪表 CHAPTER 31 - INSTRUMENTS 2(98)
