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AIR DATA INSTRUMENTS - FUNCTIONAL DESCRIPTION
AIR DATA INSTRUMENTS - FUNCTIONAL DESCRIPTION
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.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 737 has an airspeed and a mach limit to protect the
airframe. The mach airspeed warning system gives an aural
warning that tells the flight crew when the airspeed is more than
the mach or airspeed limit.
The airplane maximum operating limit speed (VMO) is 340 kts
when the airplane is at or below an altitude of 25,968 ft. Above
this altitude, the airplane is limited by mach number. The
maximum operating mach (MMO) is 0.82.
Abbreviations and Acronyms
* ADIRU - air data inertial reference unit
* ADM - air data module
* CAPT - captain
* FO - first officer
* MMO - maximum operating mach
* VMO - maximum operating limit speed
* kts - knots
OVERSPEED WARNING - INTRODUCTION
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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OVERSPEED WARNING - INTRODUCTION
OVERSPEED WARNING - INTRODUCTION
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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VMO/MMO Overspeed Warning
The mach airspeed warning system gets the overspeed
warning signal from an ADIRU. The signal means that the
airspeed is more than the maximum operating limit speed
(VMO) or the maximum operating mach (MMO). This signal
turns on the clacker sound in the aural warning module.
Test
The mach airspeed warning system has a mach airspeed
warning test switch. It is part of the flight recorder/mach
airspeed warning panel. Push one of the two mach airspeed
warning test switches to start the clacker sound in the aural
warning module. Test switch No. 1 does a test of the overspeed
warning circuit in the left ADIRU. Test switch No. 2 does a test of
the overspeed warning circuit in the right ADIRU.
OVERSPEED WARNING - GENERAL DESCRIPTION
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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OVERSPEED WARNING - GENERAL DESCRIPTION
OVERSPEED WARNING - GENERAL DESCRIPTION
EFFECTIVITY
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Flight Compartment
The flight recorder/mach airspeed warning panel is on the aft
overhead panel. The aural warning module is on the bottom of
the forward electronics panel.
OVERSPEED WARNING - COMPONENT LOCATION
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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OVERSPEED WARNING - COMPONENT LOCATION
OVERSPEED WARNING - COMPONENT LOCATION
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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General
28v dc power goes to the aural warning module. When you push
the test switch, a ground discrete goes to the air data inertial
reference unit (ADIRU). The ADIRU sends an overspeed signal
to the aural warning module. The aural warning module makes
the clacker sound. Test switch 1 goes to the left ADIRU and test
switch 2 goes to the right ADIRU.
OVERSPEED WARNING - INTERFACE
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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OVERSPEED WARNING - INTERFACE
OVERSPEED WARNING - INTERFACE
EFFECTIVITY
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