Cessna 177RG accident near Pottstown, Pennsylvania, March 28, 1999
On March 28, 1999 at about 2:12 am local time, a Cessna 177RG, registered N177AR, was substantially damaged in an accident near Pottstown, Pennsylvania (Pottstown Municipal airport). It was a personal flight under general aviation rules (Part 91). No one was hurt; 1 person was on board or involved. The weather was visual conditions (good weather).
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The NTSB's probable cause their words, unchanged
The failure of maintenance personnel to properly inspect and torque the crankcase bolts.
Source: NTSB aviation accident database, copy made October 4, 2026. Docket and reports at the NTSB.
What the record shows
- Date
- March 28, 1999 · about 2:12 am local time
- Place
- Pottstown, Pennsylvania · Pottstown Municipal · map
- Type
- Accident
- Injuries
- No one was hurt; 1 person was on board or involved.
- Weather
- visual conditions (good weather)
- Aircraft
- Cessna 177RG · all 177RGs on the register
- Registration
- N177AR · registry record · serial 177RG0192
- Damage
- Substantial damage
- Flight
- Personal flight · general aviation rules (Part 91)
The NTSB's narrative final · quoted from the NTSB record
During a climb, the engine started to shake violently and lost power. A forced landing was made to a two-lane highway, and the airplane impacted an overpass support. Inspection of the wreckage revealed the number 2 cylinder had separated from the engine. Examination of the engine revealed sealant applied to the upper portion of the crankcase. The top crankcase fasteners were tested for torque, and began to turn before the specified 96-inch pounds recommended by the manufacturer. When the crankcase was split open, fretting to the parting surfaces was observed. The center main bearing exhibited signs of movement and fretting on the bearing saddle. Fretting was also found on the number 2 and 3 cylinder flanges and corresponding crankcase decks. The engine was last overhauled on July 14, 1994. The engine had accumulated a total time of 1285 hours since the overhaul. The top parting surface of the crankcase was resealed on February 7, 1997, November 20, 1998, and March 17, 1999. The last noted entry for tightening the crankcase bolts was on June 19, 1998. The number 2 and number 3 cylinder were last removed and replaced on April 2, 1997, by an overhaul facility.
The complete narrative as the NTSB published it. The NTSB's docket holds the report as a PDF and any photographs, statements and other documents from the investigation.
The factual record from the NTSB's investigation tables, in plain English
Pilot
- Certificate: private
- Ratings: single-engine land; instrument: airplane
- Flight time: 1,720 hours in all; 1,420 in this make and model; 28 in the last 90 days; 16 in the last 30 days; 1,610 as pilot in command
- Medical certificate: Class 3 (valid medical--no waivers/lim.)
- Seat: left
The aircraft
- Airframe total time: 4,009 hours
- Last inspection: annual inspection, March 17, 1999; 10 hours since
- Maximum gross weight: 2,800 lb
- Seats: 4
- Landing gear: retractable
- Engine: Lycoming IO-360-A1B6 (piston); 0 hours total
The flight
- Departed from: RDG Reading PA at 2:00 am
- Destination: 26N Ocean City NJ
- Flight plan: none
- Runway 0
Weather at the time
- Light: night, dark
- Wind: from 020° at 8 knots
- Visibility: 10 statute miles
- Sky: clear
- Temperature: 52°F (11°C), dew point 25°F (-4°C)
- Altimeter: 30.00 inHg
- Observation at 1:54 am from PTW
Injuries
| Fatal | Serious | Minor | None | |
|---|---|---|---|---|
| Crew | 1 |
Documents from the investigation the NTSB's docket: the evidence folder behind the report
The docket, the folder of records gathered during an investigation (maintenance records, photographs, witness statements, examinations), has not been read from the NTSB for this case yet; the list appears here once it has. Open the docket at the NTSB.
About this page
Everything above comes from the NTSB's public accident database: the narrative, probable cause and findings are the NTSB's own words, and the coded tables behind its report (pilot, aircraft, flight, weather, injuries, sequence of events) are written out in plain English. Pilots' ages, home towns and medical details are left out on purpose. The documents and photographs are the NTSB's docket, the folder of records gathered during the investigation, shown as the NTSB released them (the NTSB redacts some personal details first) and listed under the NTSB's own titles. This site's own text never names pilots, passengers or anyone else involved. A preliminary report describes what is known soon after the event and can change; the final report, with the probable cause, usually follows one to two years later and this page is refreshed when it does. Case number NYC99LA081.