AFI 11-2C-130v3 - BITS

AFI11-2C-130V3 23 APRIL 2012 177
12.10.3.5. Failed Battery Relay
12.10.3.5.1. DC power Switch – BATTERY.
12.10.3.5.2. Jump battery relay by momentarily touching terminals ―A-1‖ to ―A-2‖
using the #10 jumper wire. (See Figure 12.2)
12.10.3.5.3. Check the battery voltage on voltmeter to verify closing of relay. (The
voltmeter should read bus voltage.)
12.10.3.5.4. If battery relay fails to close, (as indicated by no bus voltage on DC volt
meter) bypass the relay as follows:
12.10.3.5.4.1. Remove all power from the aircraft.
12.10.3.5.4.2. Disconnect the aircraft battery.
12.10.3.5.4.3. Install a #4 jumper wire between the A-1 and A-2 terminals. (See
Figure 12.2) WARNING: The ISOLATED DC bus cannot be isolated using bus
isolation procedures. NOTE: When the #4 jumper wire is used on the RCR, the
ISOL DC ON BATT/BATT DISC light will remain ON, even though the
Essential DC bus is powering the Isolated Bus.
12.10.3.5.4.4. Connect the aircraft battery and INS battery. WARNING: Fire
protection is not available for the GTC/APU until the aircraft battery bus is
powered. If an engine fire or nacelle overheat is indicated and battery relay has
opened, install a #4 jumper wire from terminals "A-1" and "A-2" to power the
battery bus. CAUTION: When flying with a dead or otherwise disabled
battery, ensure the DC Power Switch remains in the "BATTERY" position.
12.10.3.6. BSU #1 Failure Bypass Procedure (Used To Correct an Essential AC
Avionics Bus Failure Resulting from a BSU #1 Failure)
12.10.3.6.1. Remove External Power.
12.10.3.6.2. Pull the BSU #1 Power, three phase, ESS AC Bus circuit breaker located
on the pilot‘s side circuit breaker panel.
12.10.3.6.3. Pull the BSU #1 Power, three phase, Main AC Bus circuit breaker on the
copilot‘s upper circuit breaker panel.
12.10.3.6.4. Pull the BSU #1 ESS DC control power circuit breaker located on the
copilot‘s lower circuit breaker panel. CAUTION: When performing jumpering of
BSU connectors J1 to J4 ensure proper phase connections are made (i.e., Phase A
connected to Phase A). Crossing phases can cause damage to equipment
12.10.3.6.5. Remove J1 and J4 cannon plugs from the #1 BSU (See Figure 12.13).
12.10.3.6.6. Install jumper wire on the cannon plugs removed from the #1 BSU (See
Figure 12.14).
12.10.3.6.7. Reset circuit breakers.
12.10.3.6.8. Verify that the ESS AC Avionics Bus is powered.
12.10.3.7. BSU #2 Failure Bypass Procedure (Used To Correct a Main AC Bus
Failure Resulting from a BSU #2 Failure)