D. Aural Synthesizer Cards
(1) The aural synthesizer cards generate and amplify all warning aurals except windshear, ground proximity and TCAS warnings which are amplified only.
E. Configuration Warning Card
(1) The configuration warning card performs these functions:
(a)
Takeoff configuration warning
(b)
Landing configuration warning
(c)
Speedbrake alert
(d)
Stabilizer green band indication
(e)
Glide slope antenna switching
F. Crew Alerting Card
(1) The crew alerting card performs these functions:
(a)
Flight crew chime aurals activation/inhibits
(b)
Altitude alert
(c)
Audio output gain levels of ASC.
G. Tail Identification Card
(1) The purpose of the airplane tail identification card is to decode the nine alphanumeric buttons on the MAWEA monitor panel. The resulting airplane identification code is sent to the EIUs on an ARINC 429 bus.
H. Signal Collection Cards
(1) The signal collection cards monitor the status of various discrete signals and route them on an ARINC 429 data bus to the EIUs.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
31-51-00
ALL ú ú 09 Page 7 ú Feb 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
(2) These cards also have the capability of receiving two ARINC 429 data buses. The data received on those two data buses is collected into a single ARINC 429 data bus along with the discretes and sent to the EIUs.
I. Stall Warning Management Cards
(1) The details of the stall warning management cards are covered in the Stall Warning System (AMM 27-32-00).
J. Digital Flight Data Acquisition Card (DFDAC)
(1) The details of the DFDAC are covered in the Flight Recorder System (AMM 31-31-00).
5. Operation (Fig. 5)
_________
A. Functional Description
(1)
A fault monitoring circuit continuously monitors the output voltages of the power supplies. In the event of a loss of output voltages, discretes are sent to the MAWEA monitor panel and to signal collection card No. 1.
(2)
The discretes cause the red LEDs (Fig. 3) labelled POWER SUPPLY A FAIL and POWER SUPPLY B FAIL on the MAWEA monitor panel to illuminate. Signal collection card No. 1 monitors the discretes, converts them into a digital format and sends them to the EFIS-EICAS interface units (EIUs). The EIUs generate the message WARN ELECTRONICS on the main EICAS display.
(3)
Reset
(a) Whenever power is first applied or restored to the power supply, a pulse is sent to all the MAWEA cards to reset their microprocessors.
NOTE: When applying power to the MAWEA, be sure power is first
____ applied to the captain's and first officer's aural warning speakers.
(4) All of the MAWEA cards except for the power supplies are microprocessor controlled and have these features:
(a) One red LED for displaying faults within the card
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
31-51-00
ALL ú ú 06 Page 8 ú Oct 10/94
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
RIGHT STALL
WARNING CARD
(ULC)
MAWEA MASTER MONITOR
MONITOR CREW ALERTING CARD B (ULC)
PANEL CARD (ULC) RIGHT AURAL
LEFT AURAL SYNTHESIZER SIGNAL
SYNTHESIZER CARD COLLECTION
INPUT/OUTPUT CONNECTOR CARD CARD NO. 2 (SCID)
SIGNAL
COLLECTION
CARD NO. 4
(SCID)
AIRPLANE TAIL
IDENTIFICATION
CARD (SCID)
STALL CARD WARNING LEFT DIGITAL CARD ACQUISITION FLIGHT DATA
(ULC)
POWER
SUPPLY B
MASTER (INSIDE)
MONITOR
CARD A
(ULC)
SUPPLY A POWER (INSIDE) ELECTROSTATIC (IN CORNER) JACK
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 指示/记录系统 2
