# Incident 20210727016099I: Amazon Logistics Inc MK27, Pendleton, OR, July 27, 2021

- Type: FAA incident report (Accident/Incident Data System), as reported
- Date: July 27, 2021, 08:45 local time
- Place: Pendleton, OR
- Airport: Eastern Oregon Regional At Pendlet
- Damage: Substantial damage
- Phase of flight: Other, Specify
- Operating rules: General operating rules (Part 91)
- Location: 45.6951° N, 118.8434° W: Placed by OpenAirDocs at EASTERN OREGON RGNL AT PENDLETON (PDT), within about a mile (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=45.6951&lon=-118.8434&mi=10
- Aircraft: N138PA, a cancelled registration (https://openairdocs.org/deregistered/N138PA-2022-07-23) (OpenAirDocs)
- Registry model: Amazon Logistics MK27 (registry code 061011S, https://openairdocs.org/model/amazon-logistics-mk27) (OpenAirDocs)
- Registry engine: Amateur-built UNKNOWN ENG (registry code 99999, https://openairdocs.org/engine/amateur-built-unknown-eng) (OpenAirDocs)
- Reported make and model: AMAZON LOGISTICS INC MK27
- Reported engine: AMA/EXPR UNKNOWN ENG
- People aboard: 1
- Fatal injuries: 0
- Other injuries: 0
- Pilot certificates: Commercial pilot, flight instructor
- FAA source: FAA Aviation Safety Information Portal (https://asip.faa.gov/)
- Page: https://openairdocs.org/incident/20210727016099I

## Narrative

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

^PRIVACY DATA OMITTED^ WAS LAUNCHED FROM THE TEST AREA AS A POST-MAINTENANCE CHECK FLIGHT AFTER THE REPLACEMENT OF THE #6 PROPELLER TO NEWEST DESIGN/PART NUMBER.  IMMEDIATELY AFTER START OF ALL SIX MOTORS THE UNMANNED AIRCRAFT SHARPLY ROLLED TO THE LEFT AND HIT THE GROUND UP-SIDE-DOWN POSITION.  POWER TO ALL SIX MOTORS WAS TURNED OFF USING FLIGHT TERMINATION SYSTEM.

POST-INCIDENT INVESTIGATION REVEALED THAT THE NEWLY INSTALLED #6 PROPELLER WAS ACTUALLY A #1 PROPELLER (MARKED WITH THE WRONG PART NUMBER).  THE INSTALLED PROPELLER WAS DESIGNED FOR COUNTER-CLOCKWISE ROTATION BUT WAS INSTALLED ON A CLOCKWISE ROTATING MOTOR.  RESULTANT LIFT AND THRUST WOULD BE OPPOSITE OF INTENDED AS MOTOR RPM INCREASED.  PROPER CONTROL BY THE UNMANNED AIRCRAFT FLIGHT CONTROL COMPUTER WOULD BE IMPOSSIBLE IN THIS CONFIGURATION.

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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