20250914013489I

Incident · No damage

FAA incident report · Cessna 172N · Longmont, CO · September 14, 2025

Date
September 14, 2025 · 21:25 local
Place
Longmont, CO
Airport
Vance Brand
Phase of flight
Takeoff: Climb Out
Operating rules
General operating rules (Part 91)
Damage
No damage
Aircraft
N738HD
Reported as
Cessna 172N
Reported engine
Lycoming 0-360 series
People aboard
1
Fatal injuries
0
Other injuries
0
Pilot’s certificate
Private pilot
Pilot’s flight hours
198 total189 in this make and model31 in the last 90 days

From the FAA’s Accident/Incident Data System (AIDS), through its Aviation Safety Information Portal, as reported. The NTSB investigates accidents separately, and its record of an accident is the fuller one. The aircraft is matched to the registry by N-number and event date, checked against the reported make and model; the registry’s history has gaps, so older matches can be wrong. Compare the reported make and model.

What happened

The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.

The instrument rated pilot planned to complete three takeoffs and full stop landings at klmo for VFR night currency. Aircraft had 19 gallons of fuel on board and 6 quarts of oil in the engine. Exterior walk around, engine start, and run-up checks were normal. Takeoff roll, rotation, and initial climb-out were uneventful. At approximately 200’ AGL, the rpms rapidly decreased from 2450 to 1000 and then fluctuated between 1000 and 2450 at full throttle. PIC cycled the throttle and checked magnetos in an unsuccessful attempt to correct the problem. The PIC radioed CTAF to report the engine failure and that he was landing in a nearby field. After safely stopping, the PIC shut down the airplane to avoid a potential engine fire. Another aircraft was circling overhead, and the PIC signaled his location using a headlamp and phone flashlight. PIC walked to a nearby farmhouse and reported the event. Subsequent FAA inspection of the aircraft found no damage sustained. Original O-320 was replaced by a Lycoming O-360 A4M under STC SE2563CE on 6/15/2016. The last 100 hour engine inspection was completed on 08/08/2025; spark plugs (4) were replaced and cylinder compression checks within specifications. A post-incident engine inspection was completed on 9/25/2025; compression, induction, exhaust, primer, carburator, throttle controls, run-up and flight test all satisfactory.

As the FAA filed it

THE INSTRUMENT RATED PILOT PLANNED TO COMPLETE THREE TAKEOFFS AND FULL STOP LANDINGS AT KLMO FOR VFR NIGHT CURRENCY. AIRCRAFT HAD 19 GALLONS OF FUEL ON BOARD AND 6 QUARTS OF OIL IN THE ENGINE. EXTERIOR WALK AROUND, ENGINE START, AND RUN-UP CHECKS WERE NORMAL. TAKEOFF ROLL, ROTATION, AND INITIAL CLIMB-OUT WERE UNEVENTFUL. AT APPROXIMATELY 200’ AGL, THE RPMS RAPIDLY DECREASED FROM 2450 TO 1000 AND THEN FLUCTUATED BETWEEN 1000 AND 2450 AT FULL THROTTLE. PIC CYCLED THE THROTTLE AND CHECKED MAGNETOS IN AN UNSUCCESSFUL ATTEMPT TO CORRECT THE PROBLEM. THE PIC RADIOED CTAF TO REPORT THE ENGINE FAILURE AND THAT HE WAS LANDING IN A NEARBY FIELD. AFTER SAFELY STOPPING, THE PIC SHUT DOWN THE AIRPLANE TO AVOID A POTENTIAL ENGINE FIRE. ANOTHER AIRCRAFT WAS CIRCLING OVERHEAD, AND THE PIC SIGNALED HIS LOCATION USING A HEADLAMP AND PHONE FLASHLIGHT. PIC WALKED TO A NEARBY FARMHOUSE AND REPORTED THE EVENT. SUBSEQUENT FAA INSPECTION OF THE AIRCRAFT FOUND NO DAMAGE SUSTAINED. ORIGINAL O-320 WAS REPLACED BY A LYCOMING O-360 A4M UNDER STC SE2563CE ON 6/15/2016. THE LAST 100 HOUR ENGINE INSPECTION WAS COMPLETED ON 08/08/2025; SPARK PLUGS (4) WERE REPLACED AND CYLINDER COMPRESSION CHECKS WITHIN SPECIFICATIONS. A POST-INCIDENT ENGINE INSPECTION WAS COMPLETED ON 9/25/2025; COMPRESSION, INDUCTION, EXHAUST, PRIMER, CARBURATOR, THROTTLE CONTROLS, RUN-UP AND FLIGHT TEST ALL SATISFACTORY.