96-50 Annunciator Panel (continued)
A. Description
The COWL DOOR segment is illuminated when the fuel filler cowl door, the right
engine cowl door (which accesses the external power receptacle), or the baggage
door is not closed. The AIR FILTER segment illuminates when pressure drop across
the filter opens bypass doors, allowing unfiltered air to the engine. The EMU (Engine
Monitoring Unit) segment indicates the EMU status with either steady, flashing, or no
illumination. The EMU segment will illuminate only when the test button is depressed.
A push-to-test button on the instrument panel should cause all segments on the
annunciator panel, as well as the ROTOR BRAKE light, to illuminate when depressed.
The LOW FUEL segment takes approximately two seconds before it illuminates due
to a time delay in the circuit (time delay prevents sloshing fuel from giving a false
indication.) The EMU segment takes approximately ten seconds to perform a self-test
after the battery is switched ON before it will illuminate. The test button may be used
on the ground or in flight to verify all circuits are functioning.
B. Troubleshooting
1. Turn battery switch off. Access EMU behind right, aft seatback assembly.
2. Disconnect EMU from airframe electrical harness.
3. Using an insulated jumper, connect airframe wire -2044 (pin 13 on airframe
connector to EMU) to a convenient airframe ground.
4. Turn battery switch on. Depress push-to-test switch adjacent to annunciator panel
and observe EMU annunciator segment response:
a. If EMU annunciator segment illuminates: Turn battery switch off and disconnect
jumper. Replace EMU per § 71-43.
b. If EMU annunciator segment remains extinguished: Turn battery switch off
and disconnect jumper. Proceed to step 5.
5. Turn battery switch on. Depress push-to-test switch and verify system voltage at
wire -2044 (pin 13 on EMU airframe connector). Turn battery switch off. If there is
no system voltage at wire -2044, disconnect F695-4 tester assembly from airframe
electrical harness. Using an insulated jumper, connect airframe wire -2062 (pin 38 on
airframe connector to F695-4/F694-1 circuit board) to a convenient airframe ground.
6. Turn battery switch on. Depress push-to-test switch adjacent to annunciator panel
and observe EMU annunciator segment response:
a. If EMU annunciator segment illuminates: Turn battery switch off and disconnect
jumper. Replace F695-4 tester.
b. If EMU annunciator segment remains extinguished: Turn battery switch off
and disconnect jumper. Proceed to step 7.
APR 2017 Chapter 96 Electrical System Page 96.11
To Next Page
