TM 55-2210-223-12
TO 45A2-2-14-41
2-13.
PREOPERATION AIRBRAKE TESTS (cont)
b.
Emergency Test.
(1)
Set emergency brake valve (4) on fireman's side of cab to OPEN.
(2)
Set automatic brake valve (5) to EMERGENCY. Set emergency brake valve (4) on fireman's side of cab
to CLOSE.
(3)
Inspect the brake cylinder to ensure brakes have applied.
(4)
Set independent brake valve handle (2) to FULL APPLICTION. Push independent brake valve handle
down and hold. Inspect brake cylinder to ensure brakes have released. Release brake handle.
(5)
Move automatic brake valve (5) to RELEASE. If PCS light (6) is lit, it shall go out within 60 seconds.
c.
Train Airbrake Terminal Test.
(1)
With the brake system fully charged and with cutoff pilot valve (1) in the IN position, move automatic brake
valve handle (5) toward SERVICE position, until the equalizing reservoir pressure is reduced 15 psi (103
kPa), then stop and leave the handle in this position.
(2)
Move cutoff pilot valve (1) to the OUT position. Wait 45 to 60 seconds and time the reduction of brake
pipe pressure as indicated by locomotive brake pipe gage (3). Brake pipe leakage should not exceed 5 psi
(34 kPa) drop in 1 minute.
(3)
Optional: During the inspection of the train, automatic brake valve handle (5) may be moved toward FULL
SERVICE position to reduce equalizing reservoir slightly below brake pipe pressure, and cutoff pilot valve
(1) returned to the IN position. This action will prevent excessive loss of brake pipe pressure while
maintaining a service brake application during train inspection.
(4)
Upon completion of the train inspection and after a signal is received to release the brakes, move
automatic brake valve handle (5) to RELEASE position, and if not already there, place cutoff pilot valve
(1) in the IN position to release the train brakes.
IF THE LOCOMOTIVE FAILS TO PASS EITHER OF THE ABOVE TESTS, NOTIFY UNIT MAINTENANCE.
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