# Accident 20040702012529A: Cessna 421B, Portland, ME, July 2, 2004

- Type: FAA accident report (Accident/Incident Data System), as reported
- Date: July 2, 2004, 19:36 local time
- Place: Portland, ME
- Airport: Portland International Jetport
- Damage: Substantial damage
- Phase of flight: Roll-Out (Fixed Wing)
- Operating rules: General operating rules (Part 91)
- Location: 43.6461° N, 70.3086° W: From the FAA
- Nearby events: https://openairdocs.org/map.md?lat=43.6461&lon=-70.3086&mi=10
- Aircraft: N421KS, registered now (https://openairdocs.org/aircraft/N421KS) (OpenAirDocs)
- Registry model: Cessna 421B (registry code 2076014, https://openairdocs.org/model/cessna-421b) (OpenAirDocs)
- Registry engine: Continental GTSIO-520-C (registry code 17035, https://openairdocs.org/engine/continental-gtsio-520-c) (OpenAirDocs)
- Reported make and model: CESSNA 421B
- People aboard: 2
- Fatal injuries: 0
- NTSB investigation: [NTSB IAD04LA029](https://openairdocs.org/ntsb/IAD04LA029) (OpenAirDocs)
- FAA source: FAA Aviation Safety Information Portal (https://asip.faa.gov/)
- Page: https://openairdocs.org/incident/20040702012529A

## Narrative

As the FAA filed it, in capitals; the FAA replaces private details with ^PRIVACY DATA OMITTED^.

(-23) PILOT STATED THAT HE WAS CLEARED FOR HARBOR VISUAL APPROACH TO RUNWAY 29 AT PWM. PILOT STATED HE HAD NORMAL APPROACH AND TOUCHDOWN WITH FULL FLAPS, THREE GEAR DOWN WITH GREEN LIGHTS. PILOT STATED THAT AS THE NOSEWHEEL TOUCHED DOWN AT APPROXIMATELY 70 KNOTS, HE HEARD A "CLICK" ON THE RIGHT SIDE OF THE AIRCRAFT. PILOT THEN FELT THE RIGHT SIDE OF THE AIRCRAFT SETTLE. PILOT APPLIED LEFT BRAKE AND RUDDER AS WELL AS LEFT AILERON. PILOT STATED HE KNEW GEAR WAS COLLAPSING AS AIRCRAFT DEPARTED THE RIGHT EDGE OF THE RUNWAY WITH RIGHT MAIN GEAR COLLAPSED. NO INJURIES. POST EVENT INVESTIGATION INDICATED THAT THE WING FLAPS HAD RECEIVED NO DAMAGE, YET THE UNDERSIDE OF FUSELAGE SUFFERED BROKEN ANTENNAS AND SKIN DAMAGE. RIGHT WINGTIP ALSO SUFFERED EXTENSIVE DAMAGE. IT WAS DETERMINED THAT WING FLAPS HAD BEEN RETRACTED BY THE TIME THE RIGHT MAIN GEAR COLLAPSED AND UNDERSIDE OF AIRCRAFT CAME IN CONTACT WITH RUNWAY/GRASS. INFORMATION MADE AVAILABLE TO INVESTIGATOR ALSO INDICATED THAT AIRCRAFT HAD BEEN PARKED ON RAMP AT GROTON, CT (GON) THE NIGHT BEFORE. DURING SEVERE/VIOLENT THUNDERSTORM THE AIRCRAFT WAS ACTUALLY MOVED SEVERAL YARDS BY THE WIND. AIRCRAFT MAY HAVE SUFFERED UNDETECTED DAMAGE TO LANDING GEAR DURING THE UNATTENDED EVENT ON THE RAMP AT GROTON. NO MECHANICAL INSPECTION OF THE LANDING GEAR HAD BEEN PERFORMED PRIOR TO DEPARTURE FROM GROTON.

## The NTSB's investigation of this event (1)

From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model.

- [NTSB IAD04LA029](https://openairdocs.org/ntsb/IAD04LA029), Jul 2, 2004: Cessna 421B (N421KS), Portland, ME, substantial damage. Probable cause: Failure of the right main landing gear down-lock mechanism resulting in the collapse of the right main landing gear.

From the FAA Accident/Incident Data System. Reports are matched to registry aircraft 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. For accidents, the NTSB's own investigation is the fuller record.

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