Anti-skid test logic provides a test of the skid control circuits and an in flight test of the locked wheel circuits. The parking brake must be off (released).A 26 VAC 400 Hz signal is used as the test signal. During test, the 400 Hz signal is supplied to the control box as wheel speed. This test signal is sent to the forward or aft control section of the control box through the test switch to simulate two wheels spinning. At switch release, the test signal is removed. This appears to the control section as a skid, which results in an output to the valve and the test light. Anti-skid test logic produces test light indications on the anti-skid test panel which vary with the aircraft location and landing situation as follows:
Position the ANTI-SKID control switch to ON, BRAKE SELECT switch to NORMAL, and release the parking brakes. The ANTI-SKID INOPERATIVE light should go out and the four test lights should be out.
Apply the brakes. Momentarily actuate ANTI-SKID TEST switch to the FWD position. Upon release of the switch (center position), the two FWD lights should momentarily come on and pedal kickback should be noted if the parking brake solenoid is functioning properly.
Actuate the ANTI-SKID TEST switch to the AFT position. Upon release of the switch, the two AFT lights should momentarily come on and pedal kickback should once again be noted.