TM 9-6115-662-13&PItemNo.89IntervalBeforeBeforeTable 2-2. Operator Preventive Maintenance Checks and Servicesfor AN/MJQ-40, PU-803, and PU-804 (continued)LocationItem to Check/ServiceTRAILER-continuedAIR HOSE AND COUPLERLIGHTSa.b.a.b.c.With trailer hooked to towingvehicle, check air hose (10) forleaks, cuts, and abrasions.Check coupler body (11) fordamage. Check if seal (12) ismissing or damaged.Check for obvious damage orlooseness of lights and lenses.NOTEAn assistant is requiredwhile checking brake lights.Connect the intervehicularcable (9) to the towing vehicle.Operate the vehicle light switchthrough all settings and checkthe lights.Air leaks are found,or cuts in hose deepenough for cords toshow.Coupler body iscracked or broken.Seal is missing.Lights are damaged,not serviceable.2-14
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