MIL-PRF-26139D
shall be 10 per cent and the frequency tolerance shall be 5 per cent.
3.7.1 Blower and fan motor. The motor shall conform to NEMA MG1 and shall operate the
tester continuously under any conditions specified herein at maximum capacity without
exceeding the temperature limits for the class of insulation used. The manufacturer's
recommended full-load current shall not be exceeded during operation. The motor shall be
designed to achieve maximum reduction of starting current surge when connected for 220V
operation.
3.7.2 Blower and fan motor control. The tester shall have a remote-operated control motor which
shall utilize 110V power. Circuit breaker, part-wind starter circuit for 220V operation,
transformer fuse protection, overload heaters and reverse phase relays must be provided.
3.7.3 Compressor motor control. A 220/380/440V, single phase, 50/60 cycle motor control shall
be provided.
3.7.4. Starter and starter case. A starter case to enclose all remote controls for all electric motors
shall be furnished. A 220/380/440V to 110V control transformer shall be furnished in the starter
case. Complete instructions shall be furnished on a permanent nameplate fastened inside the
starter case giving directions for converting the tester from 220V to 380/440V operation and vice
versa.
3.7.5. Start-stop button. A momentary-contact, low-voltage protection start-stop push button
shall be provided and mounted on the instrument panel. No key ignition will be used.
3.7.6. Circuit breaker. A circuit breaker shall be furnished for each branch circuit.
3.7.7. Reverse rotation prevention device A device shall be provided that will prevent operation
of the electric motors in reverse rotation in the event of incorrect phasing.
3.7.8. Electric cable and plug. The alternating current input cable shall be an extra flexible, 4
conductor cable, in accordance with current industry practices, 50 feet in length. The 48V
contacts C1 and C2 shall be bridged at the plug. The cable shall be securely attached to the tester
to take all strain from the terminals.
3.8. Diesel engine system. Unless otherwise specified, a diesel engine and all necessary
accessories shall be selected and provided by the contractor in accordance with Appendix A.
3.9 Canopy seal system. The canopy seal system shall be capable of continuously providing 1
CFM standard oil-free air at 65 PSIG when supplied with air at 77° F and 29.92 Hg for
pressurizing aircraft canopy seals. The output of the compressor shall be controlled by an
automatic pressure regulator with manual adjustment to maintain any pressure setting throughout
a range of 5 psi to 60 psi. A safety device shall be provided to limit maximum pressure to 65 psi.
A pressure gage, 0 to 100 PSI scale ( 2% of full scale), shall be provided to indicate canopy seal
pressure. The canopy seal pressure outlet on the tester shall have an SAE AS5406-6D fitting, and
SAE AS5178-6D nut with an AN929-6D dust cap.
6
For Parts Inquires submit RFQ to Parts Hangar, Inc.
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business