- Date
- August 5, 1983, 12:45 local (20:45 UTC)
- Place
- Mcgrath, AK
- Injuries
- 1 uninjured
- Damage
- Substantial damage
- Phase of flight
- Enroute
- Aircraft
- N1106ZHughes 369D
- Weather
- Visual (VMC) · Day
- Status
- Completed
- Report
- Approved by Office Director
- NTSB office
- Alaska Regional Office
- FAA report
- 19830805042429A
- Case key
- 4150
From the NTSB’s public API. By law, NTSB reports can’t be used as evidence in lawsuits over the accident.
On this page
Sequence of events
NTSB’s coding before 2008: each occurrence and phase of flight, and the causes and factors under it. The codes are defined in NTSB’s coding manual.
Analysis
The plt stated that he was flying straight & level at aprx 700 ft AGL, when the eng-out light illuminated. He began an autorotation to a ridgeline. During the landing, the main rotor blades contacted the tail boom & severed it from the main fuselage. An investigation revealed that the eng burner drain valve had an air leakage of 3000 cc/min. The max allowable ohm limit was 800 cc/min (at 20 PSI). The combustion liner had excessive heat distortion adjacent to the large diameter hole on the right side of the skirt. The 1st stage turbine nozzle had severe heat distress on 14 trailing edge vanes & 11 leading edge vanes. The fuel nozzle had heavy carbon deposits on the spray tip & air shroud. Also, a white residue was found in the eng & a fuel sample reversed 425 parts per million of phosphorus.
Aircraft
- Registration
- N1106Z
- Reported as
- Hughes 369D
- Category
- Helicopter
- Serial number
- 210900D
- Airframe hours
- 1,617
- Engine
- Allison 250-C20B, 375 horsepower, turbo shaft
- Damage
- Substantial damage
- Flight
- Business · Part 91
- Registered owner
- Temsco Helicopters
- Airworthiness certificate
- Standard, Normal
- Last inspection
- 100 hour · July 31, 1983 · 24 hours before
- Departed
- MCG · Mcgrath, AK
Matched to the registry by N-number and the event date; the registry’s history has gaps, so older matches can be wrong. Compare the reported make and model.
Flight crew
As NTSB recorded them. NTSB leaves out names.
- Role
- Pilot
- Age
- 29
- Certificate
- Commercial
- Airplane ratings
- Single-engine land, Single-engine sea
- Instrument ratings
- Airplane
- Medical
- Class 2, Valid Medical--no waivers/lim.
- Seat
- Left
- Flight hours
- 3,640 total · 2,310 in this make and model · 3,640 as pilot in command · 375 in the last 90 days · 4 in the last 24 hours
Weather
- Conditions
- Visual (VMC) · Day
- Wind
- 260° at 12 knots, gusting 14
- Visibility
- 10 statute miles
- Lowest ceiling
- 1,500 ft overcast
- Temperature
- 45 °F
FAA reports on this event · 1
The FAA’s own accident and incident reports, matched to the aircraft by N-number and date.
Other investigations on N1106Z · 1
Matched to the same aircraft by N-number and date.