ERA24LA275

NTSB accident investigation · Piper PA23 · Montgomery, AL · June 25, 2024

Accident · No injuriesClass 4 · LimitedFinal report
Date
June 25, 2024, 13:13 local (18:13 UTC)
Place
Montgomery, AL
Injuries
1 uninjured
Damage
Substantial damage
Phase of flight
Landing
Aircraft
N14175Piper PA23
Defining event
Landing: Landing gear collapse
Weather
Visual (VMC) · Day
Status
Completed
Report
Approved by Office Director
Investigation class
Class 4 - Basic report with no Prelim publish
NTSB office
Eastern Region Aviation
Parties
FAA/FSDO
FAA report
20240625007479A
Case key
194545

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 failure of the nose landing gear actuator to maintain a fully down and locked position.

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.

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 reported that he was completing a practice instrument approach, and after extending the landing gear he saw 3 green lights, indicating the landing gear were down and locked. He continued the approach as normal and touched down on the main landing gear, but as the nose lowered it continued “straight to the ground.” The airplane skidded on its nose down the runway before coming to a stop. The forward lower portion of the airplane’s fuselage was substantially damaged. Following the accident, the nose landing gear actuator was removed, and bench-tested under the supervision of a Federal Aviation Administration inspector. The test revealed that when hydraulic pressure was removed from extension side of the actuator it began an uncommanded movement in the opposite, landing gear retraction, direction. This uncommanded movement was likely due to internal leakage in the actuator, which would have prevented the nose landing gear from remaining in the fully down and locked position.

Aircraft

Registration
N14175
Reported as
Piper PA23 (250)
Category
Airplane
Serial number
27-4739
Built
1971
Airframe hours
5,730
Engines
Lycoming IO-540-C4B5, 250 horsepower, reciprocatingLycoming IO-540-C4B5, 250 horsepower, reciprocating
Damage
Substantial damage
Flight
Personal · Part 91
Operator
Box Aviation Inc
Registered owner
Box Aviation Inc
Airworthiness certificate
Standard, Normal
Last inspection
Annual · June 5, 2024 · 18 hours before
Airport
MGM · Montgomery Rgnl (Dannelly Fld), runway 28, 9,020 × 150 ft, asphalt
Equipment
Onboard weather, Stall warning system, ADS-B, Auto-pilot, Electronic multifunction display, Electronic primary flight display

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
58
Injuries
None
Certificates
Commercial, Airline transport, Private
Airplane ratings
Multi-engine land, Single-engine land
Instrument ratings
Airplane
Medical
Class 1, Without waivers/limitations
Last flight review
October 1, 2023
Seat
Left
Restraint
3-point
Flight hours
1,701 total · 13 in this make and model · 1,522 as pilot in command · 16 in the last 90 days · 9 in the last 30 days · 1 in the last 24 hours

Weather

Conditions
Visual (VMC) · Day
Wind
270° at 7 knots
Visibility
10 statute miles
Lowest ceiling
None
Temperature
99 °F, dew point 61 °F
Altimeter
29.95 inHg
Observed at
MGM, 1 nm away
METAR
KMGM 251753Z 27007KT 10SM CLR 37/16 A2995 RMK AO2 SLP139 T03670156 10367 20233 58005

Docket · 4

The files NTSB released with the investigation on September 4, 2024, on NTSB’s docket system: statements, records, photos and specialists’ reports. 3.8 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.