BFO91LA003

NTSB accident investigation · Mooney M20M · Culpeper, VA · October 13, 1990

Accident · Serious injuriesLimited investigationFinal report
Date
October 13, 1990, 15:10 local (19:10 UTC)
Place
Culpeper, VA
Injuries
2 serious
Damage
Destroyed
Phase of flight
Takeoff
Aircraft
N987CMMooney M20M
Weather
Visual (VMC) · Day
Status
Completed · report July 10, 1992
Report
Approved by Office Director
FAA report
19901013045109A
Case key
11635

From the NTSB’s public API. By law, NTSB reports can’t be used as evidence in lawsuits over the accident.

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Probable cause

Intergranular cracking (fatigue) failure of the exhaust clamp, which resulted in a disconnected exhaust manifold (tailpipe), and subsequent fire in the engine compartment.

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.

Airframe/component/system failure/malfunctionTakeoff
Exhaust system,clamp - fatigueCause
Exhaust system,manifold/pipe - disconnectedCause
FireTakeoff - roll/run
Engine compartment - fireCause
Fuselage,crew compartment - smoke
Fuselage,crew compartment - fire
Forced landingDescent - emergency
In flight collision with terrain/waterLanding
Wheels up landing - performedPilot in command
On ground/water encounter with terrain/waterLanding
Terrain condition - ditch

Analysis

The pilot indicated that during an approach to land, he noted the smell of a possible overheat condition, but the odor went away. He checked the acft after landing, but did not notice any discrepancies. He took off shortly afterwards, and during the climbout, smoke began filling the cabin. The smoke emerged from the area of the rudder pedals and flames appeared soon afterwards. The plt turned back to the airport and landed gearup. The acft slid off the runway and into a ditch. A fire erupted, but the plt and pax escaped the acft. An investigation revealed intergranular cracking of the clamp that connected the turbocharger and tailpipe.

Aircraft

Registration
N987CM
Reported as
Mooney M20M
Category
Airplane
Serial number
27-0013
Airframe hours
199
Engine
Lycoming TIO-540-AFIA, 270 horsepower, reciprocating
Damage
Destroyed
Fire
In-Flight
Flight
Personal · Part 91
Registered owner
Charles M. Hunter
Airworthiness certificate
Standard, Normal
Last inspection
Unknown · May 18, 1990 · 74 hours before
Departed
W49
Destination
W10 · Manassas, VA
Airport
W49 · Culpeper, runway 4, 4,000 × 75 ft, asphalt

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
62
Certificate
Private
Airplane ratings
Single-engine land, Multi-engine land
Instrument ratings
Airplane
Medical
Class 3, Valid Medical--w/ waivers/lim
Seat
Left
Flight hours
2,000 total · 193 in this make and model · 1,885 as pilot in command · 83 in the last 90 days · 37 in the last 30 days · 1 in the last 24 hours

Weather

Conditions
Visual (VMC) · Day
Wind
310° at 6 knots
Visibility
30 statute miles
Lowest ceiling
11,000 ft broken
Temperature
79 °F, dew point 70 °F
Altimeter
29.70 inHg
Observed at
IAD, 15 nm away

FAA reports on this event · 1

The FAA’s own accident and incident reports, matched to the aircraft by N-number and date.