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Accident
Last updated: 13 December 2017
Status:Definitief
Datum:vrijdag 16 november 1979
Tijd:14:52
Type:Silhouette image of generic M404 model; specific model in this crash may look slightly different
Martin 4-0-4
Luchtvaartmaatschappij:Nevada Airlines
Registratie: N40438
Constructienummer: 14173
Bouwjaar: 1952
Aantal vlieguren:30451
Motoren: 2 Pratt & Whitney R-2800-CB16
Bemanning:slachtoffers: 0 / inzittenden: 3
Passagiers:slachtoffers: 0 / inzittenden: 41
Totaal:slachtoffers: 0 / inzittenden: 44
Schade: Afgeschreven
Gevolgen: Written off (damaged beyond repair)
Plaats:Grand Canyon-National Park Airport, AZ (GCN) (   Verenigde Staten)
Fase: Start (TOF)
Soort vlucht:Binnenlandse charter
Vliegveld van vertrek:Grand Canyon-National Park Airport, AZ (GCN/KGCN), Verenigde Staten
Vliegveld van aankomst:Las Vegas-McCarran International Airport, NV (LAS/KLAS), Verenigde Staten
Vluchtnummer:2504
Beschrijving:
The Martin 4-0-4 had been chartered to fly tourists to the Grand Canyon. Flight 2504 took off at 09:35 and landed at the National Park Airport around 10:45.
Takeoff for the return flight was started a t 14:50 from runway 3. The copilot was to make the takeoff from the right seat. The weather was clear, visibility unlimited, and winds were from 040deg at 15 knots. Immediately after raising the gear a loss of power from the left engine was sensed. The captain took control of the aircraft from the copilot and noticed that the left engine autofeather light was illuminated and the feather button depressed. After passing the runway the aircraft encountered a downdraft and turbulence which overcame the single engine climb performance of the aircraft. The airspeed had decreased to 105 knots and the temperature of the right engine cylinder head was rising rapidly toward the maximum limit, so the captain reduced the manifold pressure about 2 inHg to avoid engine failure. However, the inability of the aircraft to climb and the proximity of the terrain required the crew to return the right engine to full power and select a forced-landing area. The Martin collided with trees 7531 feet past the end of runway 03 and 2447 feet left of the extended centerline. The aircraft was destroyed by post-impact fire.

Probable Cause:

PROBABLE CAUSE: "The unwanted autofeather of the left propeller just after take-off and an encounter with turbulence and downdrafts, a combination which exceeded the aircraft's single-engine climb capability which had been degraded by the high density altitude and a turn to avoid an obstacle in the flight path. Also, the available climb margin was reduced by the rising terrain along the flight path. The cause(s) for the unwanted autofeather of the left propeller could not be determined."

Accident investigation:
cover
Investigating agency: NTSB
Status: Investigation completed
Duration: 194 days (6 months)
Accident number: NTSB/AAR-80-07
Download report: Final report

Bronnen:
» NTSB-AAR-80-7


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Kaart
Deze kaart geeft het vliegveld van vetrek weer en de geplande bestemming van de vlucht. De lijn tussen de vliegvelden geeft niet de exacte vliegroute weer.
De afstand tussen Grand Canyon-National Park Airport, AZ en Las Vegas-McCarran International Airport, NV bedraagt 269 km (168 miles).
Accident location: Exact; as reported in the official accident report.

This information is not presented as the Flight Safety Foundation or the Aviation Safety Network’s opinion as to the cause of the accident. It is preliminary and is based on the facts as they are known at this time.
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