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The human relay: fully energized.

It seemed like just another routine avionics-maintenance task: Aircraft 501, an EA-6B Prowler, required a new left DC hold-relay. The old one had been cannibalized from another aircraft. An AE2 and an AE3 checked out their tools and manuals, placed a MAF in work, and proceeded to the hangar to install the new relay.

They ensured power was secured and then completed the installation in accordance with the MIM. With the hard part out of the way, it was time to ensure everything was operational. The MIM calls for an electrical power test-set (AN/ASM-439). This, however, requires a low-power turn, which wasn't feasible because 501 was in the hangar for a special inspection. Instead, the two AEs opted to manually energize the relay and check the connections. This procedure isn't in the manual, and therefore is not an authorized method of testing the relay.

[ILLUSTRATION OMITTED]

They applied ground power to the jet. Then, with meter in hand, the AE3 began reading for power at all the relay terminals. Unfortunately for him, this meant sticking his hand next to a nest of wires and terminal lugs. As he reached into the panel to read for power, he brushed up against a live wire, which jolted him immediately with a painful shock. The two secured power quickly and went back to the shop.

He felt okay at first, but after a mere ten minutes, his arms felt numb and he developed a severe headache. He was taken to medical and given an EKG, medication, and a day of SIQ.

This incident was minor, but the consequences easily could have been far worse: he could have been knocked unconscious by the shock and thrown from the top of the aircraft. Since the incident, the AE3 has educated the squadron on electrical safety, ORM, and the importance of strict adherence to maintenance procedures. As a result of this incident, the squadron implemented an additional control, wearing insulated gloves, when working around power.

By AT1(AW) Kyle Morton

Petty Officer Morton is a safety petty officer at VAQ-134.

Analyst's Note: Great job on implementing additional controls for the electrical hazards associated with the AE/AT work environment. If you have added additional controls into a maintenance procedure, I strongly recommend generating a TPDR or PQDR via the Joint Defense Reporting System (JDRS). Doing so will ensure the entire community benefits from your lessons learned.--MSgt. Michael Austin

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Author:Morton, Kyle
Publication:Mech
Date:Jun 22, 2010
Words:404
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