MIL-HDBK-274 Electrical Grounding For Aircraft SafetyThis handbook has been prepared to provide U.S. Navy and Marine Corps aircraft maintenance and operations personnel with the background and technical details of the different types of aircraft grounds and how they are applied. In addition, this handbook provides background information for aircraft grounding, static electricity theory and how it affects aircraft, and techniques used for measurement of grounding points. This handbook is intended for use by all U.S. Navy and Marine Corps aircraft maintenance and operations personnel for the purposes of ensuring that aircraft are properly and safely grounded. This handbook is for guidance only and cannot be cited as a requirement.

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MIL-HDBK-274A

5.13 Shipboard grounding recommendations. Table VII outlines standard grounding recommendations for aircraft during shipboard operations. An "x" indicates the aircraft should be grounded to the appropriate deck or hangar designated grounding point for the corresponding aircraft operation.

TABLE VII. Grounding matrix for shipboard operations.

*Aircraft Grounding Matrix for Shipboard Operations
Aircraft Operation	Deck (Designated grounding point)	Hangar (Designated grounding point)
	Mooring Padeye (Note 1)	Certified Power Ground identified IAW 5.2 and 5.5, and indicating less than 25 ohms resistance (Note 2)
Parked without External Power	x	x
Maintenance performed without External Power	x	x
MEPP external power applied; Diesel Engine Powered Generator (for example,. NC-8, NC-10) (Note 3)	x	x
MEPP external power applied; Electric Driven Generator (for example, MMG) (Note 3)	NIA	x
Hangar Power Applied	NIA	x
Deck Edge Power	x	NIA
FuelingIDefueling (Note 4)	x	NIA
Ordnance LoadIDownload	x	NIA
Vertical Replenishment (Note 5, 6)	x	NIA
HIFR (Note 5, 6)	x	NIA

*Refer to NATOPS Flight Manual or MIM for detailed grounding instructions of specific

aircraft.