CEN11LA457

NTSB accident investigation · Beech B36TC · Akron, CO · June 23, 2011

Accident · Minor injuriesLimited investigationFinal report
Date
June 23, 2011, 09:15 local (15:15 UTC)
Place
Akron, CO
Injuries
2 minor
Damage
Substantial damage
Phase of flight
Approach
Aircraft
N93PPBeech B36TC
Defining event
Approach-VFR pattern final: Loss of engine power (partial)
Weather
Visual (VMC) · Day
Status
Completed · report November 3, 2011
Report
Approved by Office Director
NTSB office
Central Region
Parties
FAA Flight Standards District Office
FAA report
20110623013059A
Case key
81018

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

The mixture control cable disconnected from the cable housing attach clamp, which resutlted in the pilot's inability to add power when needed.

Findings · 1

NTSB’s coded findings. Those marked are part of the probable cause; the rest are factors or other findings. Under each, the cases with the same finding.

Engine controls: mixture controlAircraft › Aircraft power plant · InoperativeBeech B36TC: 1 caseAll aircraft: 41 casesProbable cause

Sequence of events

The events NTSB coded, in order, by phase of flight. The defining event is the one that best describes the accident. Under each, the cases with the same event anywhere in their sequence.

Analysis

The pilot reduced power for landing because the approach was slightly high. When he added power to arrest the descent, the engine failed to respond. The airplane landed short of the runway. The impact drove the main landing gear through the right wing. Examination and functional testing of the engine revealed that the mixture control cable was disconnected from the cable housing attach clamp. The cable was reattached and the engine functioned normally with no anomalies noted.

Factual narrative

On June 23, 2011, about 0915 mountain daylight time, a Beech B36TC, N93PP, impacted terrain short of the runway at Colorado Plains Regional Airport (AKO), Akron, Colorado. The pilot and passenger on board the airplane sustained minor injuries. The airplane was substantially damaged. The airplane was registered to and operated by Arizona Thunderbolts LLC, Phoenix, Arizona, under the provisions of 14 Code of Federal Regulations (CFR) Part 91 as a personal flight. Visual meteorological conditions (VMC) prevailed at the time of the accident, and no flight plan had been filed. The flight originated at Yuma (2V6), Colorado, approximately 0900 and was en route to AKO. According to the pilot, he reduced power for landing because he was slightly high. When he added power to arrest the descent, the engine failed to respond. The airplane landed short of the runway. The impact drove the main landing gear through the right wing. During the first functional test, the engine was started using high boost prime. When low boost was selected, the engine quit. During a second examination, it was discovered that the mixture control cable was disconnected from the cable housing attach clamp. When the mixture control was moved inside the cockpit, the cable and housing moved together. The mixture control cable was reconnected and the engine was functionally tested again. The engine operated at all power settings, from idle to 2,800 rpm. Mixture adjustments were made with no anomalies noted.

Aircraft

Registration
N93PP
Reported as
Beech B36TC
Category
Airplane
Serial number
EA-531
Airframe hours
1,730
Engine
Continental TSIO-520-UB, 300 horsepower, reciprocating
Damage
Substantial damage
Flight
Personal · Part 91
Operator
Arizona Thunderbolts LLC
Registered owner
Arizona Thunderbolts LLC
Airworthiness certificate
Standard, Utility
Last inspection
Annual · March 14, 2011 · 37 hours before
Departed
2V6 · Yuma, CO
Destination
Akron, CO
Flight plan
Unknown
Airport
AKO · Colorado Plains Regional, runway 11, 7,000 × 100 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
66
Injuries
None
Certificates
Commercial, Airline transport
Airplane ratings
Single-engine land, Multi-engine land
Instrument ratings
Airplane
Medical
Class 2, With waivers/limitations
Last flight review
July 12, 2010
Seat
Left
Flight hours
5,390 total · 64 in this make and model · 3,267 as pilot in command · 9 in the last 90 days · 5 in the last 30 days · 1 in the last 24 hours

Weather

Conditions
Visual (VMC) · Day
Wind
180° at 13 knots, gusting 20
Visibility
10 statute miles
Lowest ceiling
None
Temperature
72 °F, dew point 46 °F
Altimeter
30.04 inHg
Observed at
KAKO

Docket · 8

The files NTSB released with the investigation on October 4, 2011, on NTSB’s docket system: statements, records, photos and specialists’ reports. 2.5 MB in all.

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 N93PP · 1

Matched to the same aircraft by N-number and date.