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EFFECTIVITY
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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Purpose
The radio magnetic indicator (RMI) is a standby instrument. It
shows heading and bearing information.
Physical Properties
These are the physical properties of the RMI:
* Height - 3.26 in (8.28 cm)
* Width - 3.26 in (8.28 cm)
* length - 10 in (25.4 cm)
* Weight - 4.83 lb (2.2 kg).
Controls and Indicators
The RMI has two controls. They are the ADF/VOR 1, and ADF/
VOR 2 bearing pointer selectors. Turn the selector to select ADF
or VOR bearing inputs to control the position of bearing pointer
1 or 2.
The RMI has these indicators:
* Lubber line; a fixed heading reference
* Compass card; shows ADIRS heading with reference to the
lubber line
* Bearing pointers (2); shows ADF or VOR bearing relative to
the compass card.
Failure Flags
The RMI has these three failure flags:
* Heading flag; shows when heading input fails
* Bearing pointer 1 warning flag; shows when ADF 1 or VOR 1
bearing input fails or is NCD
* Bearing pointer 2 warning flag; shows when ADF 2 or VOR 2
bearing input fails or is NCD.
RMI - RADIO MAGNETIC INDICATOR
EFFECTIVITY
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RMI - RADIO MAGNETIC INDICATOR
RMI - RADIO MAGNETIC INDICATOR
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
34-22-00-004
Power
The radio magnetic indicator (RMI) receives 115v ac from the
115v ac standby bus. The power goes through the RMI circuit
breaker on the P18 panel.
Heading Input
The RMI receives digital heading data from the air data inertial
reference units (ADIRU). The heading data sets the compass
card to the magnetic heading of the airplane.
The RMI uses heading data from one ADIRU. The position of the
IRS transfer switch selects the ADIRU that gives data to the RMI.
Put the switch in NORMAL or BOTH ON L for the left ADIRU to
give data to the RMI. Put the switch in BOTH ON R for the right
ADIRU to give data to the RMI.
VOR/ADF Bearing
The RMI receives digital bearing data from the VOR and ADF
receivers. The RMI uses the bearing data to set the position of
the bearing pointers.
Each bearing pointer can show VOR bearing or ADF bearing.
Use the VOR/ADF bearing pointer selector to select VOR or ADF
data.
RMI - 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
34-22-00-005
RMI - FUNCTIONAL DESCRIPTION
RMI - FUNCTIONAL DESCRIPTION
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
34-22-00-005
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Purpose
The standby magnetic compass is a backup magnetic heading
reference.
Location
The standby magnetic compass is below the P5 forward
overhead panel.
Power
The standby magnetic compass has a 28v dc light bulb. A lamp
access cover permits replacement of the bulb.
Characteristics
The standby magnetic compass has a circular heading indicator
card. The card floats in a case filled with liquid. The liquid does
not permit the card to move quickly.
There are two magnets in the standby magnetic compass. The
magnets are parallel to each other, and they are in the
horizontal plane. The magnets align the compass with the
magnetic flux lines of the earth.
Adjustment
The standby magnetic compass has N-S (north-south) and E-W
(east-west) compensation screws. These screws change the
position of the magnets.
Use the compensation screws to correct for magnetic deviation.
Use only non-magnetic tools to turn the compensation screws.
There is a compass correction card near the compass. Use this
　
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