- Date
- November 30, 1997, 18:42 local (Dec 1, 1997, 00:42 UTC)
- Place
- Lubbock, TX
- Injuries
- 2 minor
- Damage
- Substantial damage
- Phase of flight
- Approach
- Aircraft
- N6661PPiper PA-24-250
- Weather
- Visual (VMC) · Day
- Status
- Completed · report November 6, 1998
- Report
- Approved by Office Director
- FAA report
- 19971130035869A
- Case key
- 20492
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 inadequate maintenance of the landing gear assembly by maintenance personnel resulting in a partial gear extension, and the pilot's misjudgment of a proper touchdown point to intentionally shut down the engine resulting in the airplane landing short of the runway. A factor was the soft terrain.
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
During the initial takeoff departure climb, the gear would not retract and the pilot returned to the airport where a mechanic examined the gear, serviced the struts, and performed a retraction test (gear were extended and retracted 3 consecutive times). Subsequently, the flight departed on the cross country flight with a planned refueling stop. During the approach, the gear would not extend. The pilot maneuvered in the area and performed the emergency gear extension procedures; however, the gear would not go beyond 1/2 extension. During the final approach to the runway, the pilot shut down the engine and the airplane landed short of the runway. The FAA inspector and a mechanic found that the 'slide tubes on the main gear had accumulated a lot of dirt causing some binding on their normal operation. This binding consistently caused the gear electric motor circuit breaker to pop.' The gear could be extended manually by the FAA inspector and the mechanic. Flight time since the last annual inspection was 57 hours.
Factual narrative
On November 30, 1997, at 1842 central standard time, a Piper PA-24-250, N6661P, owned and operated by a private individual under Title 14 CFR Part 91, the gear collapsed while landing short of runway 35L at the Lubbock International Airport, Lubbock, Texas. The commercial pilot and the passenger received minor injuries, and the airplane sustained substantial damage. The airplane, operating on an IFR flight plan, encountered visual meteorological conditions prior to the accident. The flight departed San Antonio, Texas, at 1215.
During a personal interview, conducted by the investigator-in-charge, and on the Pilot/Operator Aircraft Accident Report (NTSB Form 6120.1/2), the pilot reported that during the initial climb from San Antonio, the gear would not retract. He returned to the airport where a mechanic examined the gear, serviced the struts, and performed a retraction test (gear was extended and retracted 3 consecutive times). Subsequently, the flight departed San Antonio for Colorado Springs, Colorado. En route the flight encountered headwinds and the pilot decided to make a refueling stop at Lubbock. During the approach at Lubbock, the landing gear would not extend. The pilot maneuvered in the area and performed the emergency gear extension procedures for 2 hours trying to get the gear extended; however, it would not go beyond 1/2 extension. During the final approach to runway 35L, the pilot shut down the engine to try to save the propeller. The airplane landed short of the runway in soft terrain.
The FAA inspector and a mechanic examined the airplane at Lubbock. Structural damage occurred to the firewall, engine mounts, and fuselage. The mechanic, a previous owner of a PA-24-250 airplane, has over 20 years of maintenance experience working on equivalent equipment. The mechanic found that the "slide tubes on both the main gear had accumulated a lot of dirt causing some binding on their normal operation. This binding consistently caused the gear electric motor circuit breaker to pop." The gear could be extended manually by the FAA inspector and the mechanic.
A review of the maintenance records by the FAA inspector revealed that the last annual inspection was completed on April 30, 1997. Flight time since the annual inspection was 57 hours.
Aircraft
- Registration
- N6661P
- Reported as
- Piper PA-24-250
- Category
- Airplane
- Serial number
- 24-1784
- Airframe hours
- 5,151
- Engine
- Lycoming O-540-A1C5, 250 horsepower, reciprocating
- Damage
- Substantial damage
- Flight
- Personal · Part 91
- Registered owner
- Robert L. Zimmerman
- Airworthiness certificate
- Standard, Normal
- Last inspection
- Annual · April 30, 1997 · 57 hours before
- Departed
- SAT · San Antonio, TX
- Destination
- LBB
- Flight plan
- IFR
- Airport
- LBB · Lubbock International, runway 35L, 11,500 × 150 ft, concrete
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
- 79
- Certificate
- Commercial
- Airplane ratings
- Single-engine land
- Instrument ratings
- Airplane
- Medical
- Class 2, Valid Medical--w/ waivers/lim
- Seat
- Left
- Flight hours
- 3,865 total · 3,862 in this make and model · 3,830 as pilot in command · 50 in the last 90 days · 11 in the last 30 days · 4 in the last 24 hours
Weather
- Conditions
- Visual (VMC) · Day
- Wind
- 20° at 5 knots
- Visibility
- 10 statute miles
- Lowest ceiling
- None
- Temperature
- 46 °F, dew point 43 °F
- Altimeter
- 29.00 inHg
- Observed at
- LBB
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 N6661P · 1
Matched to the same aircraft by N-number and date.