NTSB Identification: BFO86FA020.
The docket is stored on NTSB microfiche number 32945.
Accident occurred Wednesday, March 12, 1986 in UPPER MARLBORO, MD
Aircraft: CESSNA 172H, registration: N2780L
Injuries: 3 Uninjured.

NTSB investigators either traveled in support of this investigation or conducted a significant amount of investigative work without any travel, and used data obtained from various sources to prepare this aircraft accident report.

SINCE THE FUEL GAGES IN THE ACFT WERE KNOWN NOT TO BE ACCURATE, THE PLT MEASURED THE AMOUNT OF FUEL IN EACH TANK WITH A DIPSTICK BEFORE DEPARTING. HE DETERMINED THAT HE HAD 18 GALLONS FOR THE 2 HOURS OF FLYING HE PLANNED TO DO AND BASED ON A FUEL CONSUMPTION RATE OF 5 GPH HE WOULD HAVE 8 GALLONS TO SPARE. THE ACFT RAN OUT OF FUEL SHORT OF HIS DESTINATION AND NOSED OVER IN A FIELD DURING THE ENSUING LANDING. USING A CESSNA AIRCRAFT PERFORMANCE CHART THAT WAS IN THE ACFT, THE CONSUMPTION RATE FOR THE ENGINE RUNNING AT 75% POWER AT 2500 FEET MSL WAS 8.5 GPH. THE 8.5 GPH DOES NOT TAKE INTO ACCOUNT THE FUEL REQUIRED FOR ENG START, TAXI AND CLIMB.

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

PREFLIGHT PLANNING/PREPARATION..INADEQUATE..PILOT IN COMMAND

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

FUEL CONSUMPTION CALCULATIONS..IMPROPER..PILOT IN COMMAND

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

FLUID,FUEL..EXHAUSTION

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

FUEL SUPPLY..INADEQUATE..PILOT IN COMMAND


Contributing Factors

TERRAIN CONDITION..DOWNHILL


Contributing Factors

TERRAIN CONDITION..ROUGH/UNEVEN

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