(e)  
Aft Cargo Compartment Door Warning Circuit Test 1) Repeat step (c) for aft cargo compartment door.

(f)  
Lower Nose Compartment Access Door Warning Circuit Test 1) Repeat step (c) for lower nose compartment access door.

NOTE:  Lower nose compartment access door and electronic equipment compartment external access door share the EQUIP warning light.

(g)  
Electronic Equipment Compartment External Access Door Warning Circuit Test 1) Repeat step (c) for electronic equipment compartment external access door.

NOTE:  The electronic equipment compartment external access door and lower nose compartment access door share the EQUIP warning light.

(h)  
Left Tire Burst Protector Screen Door Warning Circuit Test (If installed) 1) Repeat step (c) for left tire burst protector screen door.

NOTE:  The left and right tire burst protector screen doors share the TIRE SCREEN warning light.

(i)  
Right Tire Burst Protector Screen Door Warning Circuit Test (If installed) 1) Repeat step (c) for right tire burst protector screen door.

(j)  
Aft Entry Door Warning Circuit Test
1) Repeat step (c) for aft entry door.

(k)  
Forward Airstair Door Warning Circuit Test
1) Open airstair door. See 52-61-0, Description/Operation.
2) Check that forward entry door is closed and locked.
3) Check that the following lights are on:

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NOTE:  The right and left tire burst protector screen doors share the TIRE SCREEN warning light.
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a) AIR STAIR on Door Warning Module b) Both MASTER CAUTION lights c) DOORS lamps on master caution annunciator
4) Close and lock airstair door
5) Check that all lights go out.

(4)  Restore airplane to normal.
CAUTION:  TO LESSEN THE POSSIBILITY OF HEAT DAMAGE, AND AT THE SAME TIME PROLONG LAMP LIFE ON ALL INDICATORS, THE MASTER SWITCH SHOULD BE PLACED IN THE “DIM” POSITION DURING EXTENDED PERIODS OF GROUND OPERATION.
(a)  Determine if there is further need for electrical power, if not, remove power.
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MISCELLANEOUS SWITCHING MODULE - REMOVAL/INSTALLATION
1.  Miscellaneous Switching Module Removal
A.  Make sure there is no electrical power on the airplane.
B.  Loosen the clamp that holds the module to the E3-2 rack.
C.  Pull the module out of the E3-2 rack.
2.  Miscellaneous Switching Module Installation
A.  General
(1)  
The Miscellaneous Switching Module (M278) contains printed circuit cards. These cards operate with proximity sensors to act as switches. The function of each card and sensor is written on the cover of the module.

(2)  
When the M278 module is installed on the E3-2 rack it is necessary to do a test of each of the card/sensors. Refer to 52-71-31/501 for this test.

B.  Install the Miscellaneous Switching Module (M278).
(1)  
Make sure there is no electrical power on the airplane.

(2)  
Put the M278 module in its position on the E3-2 rack.

(a)  Tighten the clamp on the module.

(3)  
Supply electrical power (Ref 24-22-00/201).

(4)  
Do the test of the M278 module (Ref 52-71-31/501).

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MISCELLANEOUS SWITCHING MODULE - ADJUSTMENT/TEST
1.  Miscellaneous Switching Module Test
A.  General
(1)  
This test is to make sure the circuits through the Miscellaneous Switching Module (M278) operate correctly. The name of the circuit for each card is on the cover of the module.

(2)  
It is only necessary to do this test if you replace the entire M278 module. If you replace an individual card in the module, do a test of that card and its circuit only.

B.  Provide electrical power (Ref 24-22-00/201).
C.  Do the test of the Door Warning Circuits (Ref 52-71-00/501).
D.  Do a test of the APU horn driver.
(1)  
Make sure these circuit breakers are closed:

(a)  
FIRE PROTECTION DETECTION, APU

(b)  
MASTER WARNING AND CONTROL

(c)  
LANDING GEAR, LIGHTS

(d)  
　
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