- Date
- June 30, 1990, 13:05 local (21:05 UTC)
- Place
- Anchorage, AK
- Injuries
- 1 uninjured
- Damage
- Substantial damage
- Phase of flight
- Enroute
- Aircraft
- N8054ACessna 170B
- Weather
- Visual (VMC) · Day
- Status
- Completed · report February 22, 1994
- Report
- Approved by Office Director
- NTSB office
- Alaska Regional Office
- FAA report
- 19900630026699A
- Case key
- 5394
From the NTSB’s public API. By law, NTSB reports can’t be used as evidence in lawsuits over the accident.
On this page
Probable cause
A power loss due to a fatigue failure of the #5 exhaust rocker arm.
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 pilot reported a loss of engine power and a subsequent forced landing. Investigation revealed that the #5 exhaust rocker arm had failed due to fatigue.
Aircraft
- Registration
- N8054A
- Reported as
- Cessna 170B
- Category
- Airplane
- Serial number
- 20906
- Engine
- Continental O-300A, 145 horsepower, reciprocating
- Damage
- Substantial damage
- Flight
- Personal · Part 91
- Registered owner
- Thomas A. Dalrymple
- Airport
- NONE
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
- 34
- Certificate
- Student
- Airplane ratings
- Single-engine land
- Medical
- Class 3, Valid Medical--no waivers/lim.
- Flight hours
- 52 total · 45 in this make and model · 15 as pilot in command · 27 in the last 90 days · 4 in the last 30 days · 2 in the last 24 hours
Weather
- Conditions
- Visual (VMC) · Day
- Wind
- 315° at 5 knots
- Visibility
- 40 statute miles
- Lowest ceiling
- None
- Temperature
- 64 °F, dew point -0 °F
FAA reports on this event · 1
The FAA’s own accident and incident reports, matched to the aircraft by N-number and date.