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NTSB Report
May 13, 1991 · Cessna 207A · N6280H
Grand Canyon, AZ
Overview
Report Status
Probable Cause
Event Type
Accident
Date
May 13, 1991
Injury Outcomes
7 injuries (7 fatalities)
Location
Grand Canyon, AZ
Aircraft
Cessna 207A
Tail Number
N6280H
Operator
Air Grand Canyon
Injuries
Fatal
Aircraft Damage
Destroyed
NTSB Number
LAX91FA213
THE AIRPLANE CRASHED INTO A WOODED AREA ABOUT 8 MINUTES AFTER TAKEOFF. EVIDENCE AT THE WRECKAGE SITE REVEALED THAT THE AIRPLANE CRASHED THROUGH THE TREES AT A GLIDE ANGLE OF 8 DEGREES. THE GLIDE ANGLE FOR A POWER-OFF FORCED LANDING IS 6 DEGREES ACCORDING TO THE PILOT'S OPERATING HANDBOOK. THE PROPELLER DID NOT EXHIBIT ROTATIONAL DAMAGE. ENGINE TEARDOWN REVEALED THAT THE #1 CYLINDER HAD CATASTROPHIC DETONATION.
NTSB Probable Cause
DETONATION (OR PRE-IGNITION) IN THE NUMBER 1 CYLINDER, WHICH RESULTED IN EROSION (BURNING) OF THE NUMBER 1 PISTON AND SUBSEQUENT LOSS OF ENGINE POWER. A FACTOR RELATED TO THE ACCIDENT WAS: THE LACK OF SUITABLE TERRAIN FOR AN EMERGENCY LANDING.
Full Narrative
THE AIRPLANE CRASHED INTO A WOODED AREA ABOUT 8 MINUTES AFTER TAKEOFF. EVIDENCE AT THE WRECKAGE SITE REVEALED THAT THE AIRPLANE CRASHED THROUGH THE TREES AT A GLIDE ANGLE OF 8 DEGREES. THE GLIDE ANGLE FOR A POWER-OFF FORCED LANDING IS 6 DEGREES ACCORDING TO THE PILOT'S OPERATING HANDBOOK. THE PROPELLER DID NOT EXHIBIT ROTATIONAL DAMAGE. ENGINE TEARDOWN REVEALED THAT THE #1 CYLINDER HAD CATASTROPHIC DETONATION.
Flight
Event TypeAccident
Event Time13:19 MST
Nearest Airport0nm N
Runway0
Flight Plan FiledCvfr
Aircraft FireGrd
Aircraft ExplosionGrd
Aircraft
AircraftCessna 207A
Tail NumberN6280H
Aircraft CategoryAir
DamageDestroyed
OperatorAir Grand Canyon
Operating RulePart 135
Engines1
Engine TypeReciprocating
Engine DetailsContinental · TSIO-520-M · Reciprocating · 285
Seats7
People & Injuries
Injury Summary7 injuries (7 fatalities)
Fatal7
Serious0
Minor0
Uninjured0
Total7
Crew 1Age 26 · Second Class
Conditions
ConditionsVMC
LightDaylight
Wind210° @ 11 kt, gusting 18 kt
Visibility50 sm
CeilingBroken clouds 25000 ft
Temperature / Dew Point0 C / 0 C
Altimeter0
Observation Time20:55
Weather SourceWFAC