Hughes 369D N1106Z

Summary

On 5 August 1983 at about 20:45 local time, a Hughes 369D registered N1106Z was involved in an accident near McGrath, Alaska, United States. One person was on board and nobody was injured. The aircraft was substantially damaged. No probable cause statement is available for this record.

Date

5 August 1983 at 20:45

Classification

Accident

Location

McGrath, Alaska, United States

Coordinates

63.6097, -154.7796

Aircraft

Hughes 369D

Registration

N1106Z

Category

Helicopter

Engines

1

Operator

Not recorded

Operating rule

Part 91: General Aviation

Purpose of flight

Business

Phase of flight

Not recorded

Route

McGrath → Unknown

Aircraft damage

Substantial

Weather

VMC

Light

Day

NTSB number

ANC83LA138

Nobody was injured.

The NTSB has not published a probable cause for this record. No probable cause statement is present in the source data.

Nothing about the cause is stated here that is not in the source record.

Read the full NTSB narrative

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.

Quoted verbatim from the NTSB record.