MIL-S-4953C(USAF)
3.14.5.6 Electric timer. A hermetically sealed electric timer shall be provided in the electrical system between the trigger switch on the gun and the solenoid valve in the system. The timer shall close the solenoid valve when the trigger is depressed and cause the compound to spray from the nozzle. The timer shall be set to operate at 2 second intervals between spray injections. The timer shall be capable of being regulated to permit predetermined quantities of 50 cubic centimeters (cc) to a pint of compound to be sprayed. The timer shall be set to spray 50 ±2 cc of corrosion-preventive mixture by one depression of the trigger. A switch shall be provided to bypass the timer during preoiling operations so the solenoid valve will remain closed as long
as the trigger switch is depressed.
3.14.5.7 All electrical equipment, apparatus, and wiring used in operation from the local power source shall be explosion-proof. The explosion-proofing shall be suitable for use in class I, division II, group D atmospheres as specified in Pamphlet 70.
3.15 Application equipment.
3.15.1 Corrosion preventive compound. The gun and nozzle for spraying the compound shall be in accordance with Henry Spen & Co Drawing 600113, Revision C, with the following exceptions:
a. The handle shall be of a thermosetting plastic material which is resistant to damage by impact, oil and heat.
b. The cable conforming to Henry Spen & Co Drawing 100489 may be any suitable two- conductor cable with an oil-resistant cover and of suitable length to be taped or clamped to the delivery hoses.
c. The handle shall incorporate a moveable trigger which actuates a single-pole, single throw (normally open) switch. The trigger shall be positioned for operation by the operator's index finger.
d. The switch shall be installed inside of the handle and connected to the pin connector at the butt of the handle by installing the leads inside of the handle.
3.15.2 Preoiling fittings. The necessary fittings for applying the preoiling fluid shall be provided. The fittings shall be adaptable to fit on the end of a 6 foot length of hose which shall be fastened to the spray gun in lieu of the corrosion-preventive compound nozzle. The following fittings
shall be provided :
a. 1 inch - 18 National Special (NS) threaded by 2 inches long b. 3/4 inch - 14 National Taper Pipe (NPT) by 2 inches long
c. 1/4 inch - 18 NPT by 2 inches long
d. 1/8 inch - 27 NPT by 2 inches long
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