CEN12LA094

NTSB accident investigation · Cessna 305A · Fredericksburg, TX · November 30, 2011

Accident · No injuriesLimited investigationFinal report
Date
November 30, 2011, 11:15 local (17:15 UTC)
Place
Fredericksburg, TX
Injuries
1 uninjured
Damage
Substantial damage
Phase of flight
Approach
Aircraft
N6735QCessna 305A
Defining event
Approach-VFR pattern final: Loss of engine power (total)
Weather
Visual (VMC) · Day
Status
Completed · report March 28, 2012
Report
Approved by Office Director
NTSB office
Central Region
Parties
FAA FSDO
FAA report
20111130028499A
Case key
82433

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 pilot's inadequate preflight inspection, which resulted in a subsequent loss of engine power due to fuel starvation.

Findings · 4

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.

Inspection: preflight inspectionPersonnel issues › Task performance · PilotCessna 305A: 1 caseAll aircraft: 551 casesProbable cause
Engine (reciprocating)Aircraft › Aircraft power plant · FailureCessna 305A: 1 caseAll aircraft: 497 casesProbable cause
Fluids: fuelAircraft › Fluids/misc hardware · Fluid levelCessna 305A: 2 casesAll aircraft: 1,695 casesProbable cause
Fuel systemAircraft › Aircraft systems · Not inspectedCessna 305A: 1 caseAll aircraft: 181 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

While on approach to the runway, the pilot added power to the engine to adjust the approach path, and the engine did not respond. The pilot was unable to restart the engine, and he performed a forced landing to a nearby field. During the landing, the airplane struck a wire and then the ground. Postaccident examination of the airplane revealed that caps were present on the fuel tank vent lines, creating a vacuum and preventing fuel flow to the engine. The pilot said that he had placed the caps on the fuel vent lines to keep insects out of the lines and the fuel tanks and forgot to remove them during his preflight inspection. The pilot reported no preaccident mechanical malfunction or failure of the airplane that would have precluded normal operation.

Factual narrative

On November 30, 2011, approximately 1115 central standard time, a Cessna 305A, N6735Q, was substantially damaged during a forced landing near Gillespie County Airport (T82), Fredericksburg, Texas. Visual meteorological conditions prevailed at the time of the accident. The local flight was conducted under the provisions of 14 Code of Federal Regulations Part 91 without a flight plan. The pilot was not injured. The flight departed New Braunfels, Texas, approximately 1030. While on approach to the runway the pilot added power to the engine to adjust his approach path and the engine did not respond. The pilot was unable to restart the engine and set up for a forced landing to a nearby field. During the forced landing, the airplane struck a wire and then the ground. The right main landing gear was bent, the firewall was wrinkled, and the fuselage adjacent to the right wing strut was buckled. Examination of the airplane revealed that caps were present on the fuel tank vent lines. When the caps were removed, pressure release and air movement could be heard from the tanks. The fuel tanks contained an adequate supply of fuel. No other mechanical anomalies, malfunctions, or failures were noted which would have contributed to the accident. The pilot reported that he had placed the caps on the fuel vent lines to keep insects out of the lines and the fuel tanks and forgot to remove them during his preflight inspection.

Aircraft

Registration
N6735Q
Reported as
Cessna 305A
Category
Airplane
Serial number
22658
Airframe hours
7,100
Engine
Teledyne Continental Motors O-47-11, 213 horsepower, reciprocating
Damage
Substantial damage
Flight
Personal · Part 91
Airworthiness certificate
Standard, Normal
Last inspection
Annual · September 20, 2011
Departed
KBAZ · New Braunfels, TX
Destination
T82 · Fredericksburg, TX
Airport
T82 · Gillespie County Airport

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
69
Injuries
None
Certificate
Private
Airplane ratings
Single-engine land
Medical
Class 3, With waivers/limitations
Last flight review
August 25, 2011
Seat
Front
Flight hours
2,678 total · 381 in this make and model · 2,588 as pilot in command · 48 in the last 90 days · 2 in the last 30 days · 1 in the last 24 hours

Weather

Conditions
Visual (VMC) · Day
Wind
Calm
Visibility
10 statute miles
Lowest ceiling
None
Temperature
52 °F, dew point 32 °F
Altimeter
30.25 inHg
Observed at
KT82

Docket · 2

The files NTSB released with the investigation on February 2, 2012, on NTSB’s docket system: statements, records, photos and specialists’ reports. 1.2 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 N6735Q · 1

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