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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
34-24-00-004
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STANDBY ATTITUDE REFERENCE SYSTEM - STANDBY ATTITUDE INDICATOR
34-24-00
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D633A101-SHZ1 Oct 10/2002
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
General
The standby attitude indicator uses a gyro stabilized attitude
ball to show airplane attitude.
The gyro starts to operate when you apply power. The gyro
normally aligns to vertical at a rate of three degrees per minute.
You can pull the cage knob to align the gyro to vertical in a few
seconds.
The standby attitude indicator uses inputs from ILS receiver 1 to
supply a backup glideslope and localizer display.
Power
The static inverter/power supply gives 115v ac to the gyro
motor. A gyro current monitor circuit causes the gyro flag to
come into view when gyro power is not there or is incorrect. The
static inverter/power supply also gives dc voltages for circuit
functions.
ILS Operation
ILS or GLS deviation data goes to the ARINC 429 receiver. The
ARINC 429 receiver sends the data to the logic and drive
circuits. These circuits control the localizer deviation pointer
and the failure flag. They also control the glideslope deviation
pointer and failure flag.
An ILS mode select discrete and the approach mode selector
position sets the ILS mode and validity.
When you select the OFF mode or when an NCD or incorrect
data signal is present, the deviation pointers go out of view.
When you select the APP mode and the ILS or GLS data is
correct, the localizer and glideslope deviation pointers show
ILS or GLS deviation.
When you select the B/CRS mode, the localizer deviation
pointer signal reverses, and the glideslope deviation pointer
goes out of view. Since there is no GLS backcourse signal, B/
CRS can not be used when under GLS guidance.
ILS Failure Flags
The ILS failure flags are normally out of view. When ILS or GLS
data is incorrect, the G/S flag, the LOC flag, or both flags will
come into view.
STANDBY ATTITUDE REFERENCE SYSTEM - FUNCTIONAL DESCRIPTION
EFFECTIVITY
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D633A101-SHZ1 Feb 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
34-24-00-005
STANDBY ATTITUDE REFERENCE SYSTEM - FUNCTIONAL DESCRIPTION
STANDBY ATTITUDE REFERENCE SYSTEM - FUNCTIONAL DESCRIPTION
EFFECTIVITY
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D633A101-SHZ1 Oct 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
34-24-00-005
STANDBY ATTITUDE REFERENCE SYSTEM - FUNCTIONAL DESCRIPTION
STANDBY ATTITUDE REFERENCE SYSTEM - FUNCTIONAL DESCRIPTION
EFFECTIVITY
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D633A101-SHZ1 Jun 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
34-24-00-005
General
There are no special tests for the standby attitude reference
system. You do a check of the approach display with an ILS
receiver 1 self-test.
Start the ILS self-test from the test switch on the navigation
control panel. You can also start it from the test switch on the
ILS receiver 1. The approach mode selector must be in the APP
position.
There are four display sequences that occur on the standby
attitude indicator during the ILS self-test:
* Invalid data
* No computed data (NCD)
* Data correct - up/left
* Data correct - down/right.
The length of the self test sequence is 14 seconds.
Invalid Data Display
Invalid data is the first display in the self-test sequence. It shows
on the standby attitude indicator for three seconds. Invalid data
causes these indications:
* LOC flag comes into view
* G/S flag comes into view
* Deviation pointers go out of view.
NCD Display
NCD is the second display in the self-test sequence. It shows on
the standby attitude indicator for two seconds. NCD causes
these indications:
* LOC flag goes out of view
* G/S flag goes out of view
* Deviation pointers go out of view.
Data Correct - Up/Left Display
Data correct - up/left is the third display in the self-test
sequence. It shows for three seconds on the standby attitude
indicator. Data correct - up/left causes these indications:
* LOC flag goes out of view
* G/S flag goes out of view
* Localizer pointer shows one dot of left deviation
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