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The standby altimeter/airspeed indicator is in the flight
compartment.
AIR DATA INSTRUMENTS - COMPONENT LOCATION
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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AIR DATA INSTRUMENTS - COMPONENT LOCATION
AIR DATA INSTRUMENTS - COMPONENT LOCATION
EFFECTIVITY
SHZ ALL 34-13-00
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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Power
The vibrator in the standby altimeter/airspeed indicator gets 28v
dc from the dc standby bus, through the CAPT ALT/AS
VIBRATOR circuit breaker.
The indicator gets 5v ac for the internal instrument lights from
the master dim and test circuit.
Pitot-Static Interface
The alternate pitot probe sends pitot air pressure to the standby
altimeter/airspeed indicator. The alternate static ports send
static air pressure to the indicator.
AIR DATA INSTRUMENTS - INTERFACE
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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AIR DATA INSTRUMENTS - INTERFACE
AIR DATA INSTRUMENTS - INTERFACE
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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General
The standby altimeter/airspeed indicator shows air data
information such as barometric altitude and indicated
airspeed. The standby altimeter/airspeed indicator receives
pitot pressure from the alternate pitot probe. It also receives
static pressure from the alternate static ports.
Operation
The digital altitude display shows barometric altitude from -1000
to 50000 feet in thousands of feet. The altitude dial and pointer
show altitude in 20 foot increments. One turn of the pointer is
equal to 1000 feet.
Barometric pressure reference in inches of mercury (in hg) and
millibars (mb) shows on the indicator. Rotate the barometric
reference control knob to set the barometric pressure
reference. It is adjustable from 745 to 1049.5 mb and from
22.00 to 30.99 in hg.
The zero adjust screw lets you adjust the altitude without
changing the barometric reference settings.
The digital airspeed display shows airspeeds from 60 to 450
knots. A drum, graduated in knots, shows the indicated
airspeed.
AIR DATA INSTRUMENTS - STANDBY ALTIMETER/AIRSPEED INDICATOR
EFFECTIVITY
SHZ ALL 34-13-00
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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
34-13-00-005
AIR DATA INSTRUMENTS - STANDBY ALTIMETER/AIRSPEED INDICATOR
AIR DATA INSTRUMENTS - STANDBY ALTIMETER/AIRSPEED INDICATOR
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
34-13-00-005
General
The standby altimeter/airspeed indicator consists of these two
pneumatic instruments:
* Standby altimeter
* Standby airspeed indicator.
Standby Altimeter
A vibrator is on the instrument frame to reduce friction errors in
the mechanical linkage and to improve indicator response. The
vibrator receives 28 volts dc power from the 28v dc standby bus.
The standby altimeter gets static pressure from the two
alternate static ports. The pressure sensor moves in
response to the static pressure change. The sensor drives the
altitude gear train which connects mechanically to the altitude
counter and pointer.
Rotating the BARO set knob on the front panel corrects for local
changes in barometric pressure.
Standby Airspeed Indicator
The indicator mechanism has two pressure ports. One port is
for static pressure and the other port is for pitot pressure. The
pressure sensor expands and contracts with changes in the
pitot-static pressure. The movement is transmitted to a counter
to indicate airspeed.
AIR DATA INSTRUMENTS - FUNCTIONAL DESCRIPTION
EFFECTIVITY
SHZ ALL 34-13-00
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D633A101-SHZ1 Jun 10/2003
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
　
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