# NTSB CHI84IA314: Boeing 727-2M7, N721RW, Minneapolis, MN, July 25, 1984

- Type: NTSB incident investigation
- Classification: Incident · No injuries · Incident investigation · Final report
- Date: July 25, 1984, 14:50 local (19:50 UTC)
- Place: Minneapolis, MN
- Location: 44.9800° N, 93.2638° W: Placed by OpenAirDocs: center of Minneapolis, MN, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=44.9800&lon=-93.2638&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 127 uninjured
- Status: Completed
- Report: Approved by Office Director
- NTSB case key (mKey): 12457
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CHI84IA314
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/12457/pdf
- Page: https://openairdocs.org/ntsb/CHI84IA314

## Sequence of events

In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf).

- Airframe/component/system failure/malfunction, climb
  - flt control syst,wing flap control - previous damage (cause)
  - flt control syst,wing flap control - failure,partial (cause)

## Analysis

THE CREW REPORTED THAT THEY NOTICED A DECREASE IN CLIMB RATE WHILE OVER RAPID CITY, SD, EN ROUTE FROM MSP TO SFO AT FLT LEVEL 310. THE PLT NOTED FUEL BURN WAS APRX 1400 LBS AHEAD OF SCHEDULE. IN-FLT INSPECTION REVEALED THAT THE INBOARD TRAILING EDGE FLAPS HAD FAILED TO RETRACT PROPERLY AFTER TAKEOFF AND REMAINED IN A 7 DEG DOWN POSITION. THE FLT RETURNEDTO MINNEAPOLIS AND LANDED AT 1540 CDT (APRX 50 MINS AFTER THE INCIDENT). A POST FLT INSPECTION DISCLOSED THAT THE INBOARD FLAP CONTROL VALVE HAD FAILED. THE FLT CREW SAID THAT THIS MALFUNCTION HAD OCCURRED ON A PREVIOUS FLT AND HAD BEEN REPORTED. THE FLAPS HAD GROUND CHECKED OK BOTH ON THIS & THE PREVIOUS OCCASION. THIS REPORTED FAILURE WAS CORRECTEDBY REPUBLIC AIRLINES MAINTENANCE BY REPLACEMENT OF A FLAP CONTROL VALVE AND INSPECTION OF THE RIGGING IN ACCORDANCE WITHBOEING MAINTENANCE MANUAL 27-51-51, AFTER THIS INCIDENT.

## Aircraft

- Registration: [N721RW](https://openairdocs.org/deregistered/N721RW-2007-08-15), registration cancelled 2007-08-15, S/N 21200, built 1976 (OpenAirDocs)
- Reported make and model: BOEING 727-2M7
- Registry model: [Boeing 727-2M7](https://openairdocs.org/model/boeing-727-2m7) (registry code 138407S) (OpenAirDocs)
- Registry engine: [Pratt & Whitney JT8D-9 series](https://openairdocs.org/engine/pratt-whitney-jt8d-9-series) (registry code 52048, turbo-jet) (OpenAirDocs)
- Category: Airplane
- Serial number: 21200
- Engines: P&W JT8D 15000 lbs thrust turbo fan
- Damage: No damage
- Flight: Part 121
- Registered owner: Republic Airlines
- Airworthiness certificate: Standard, Transport
- Departed: MSP, MINNEAPOLIS, MN
- Destination: SFO, SAN FRANCISCO, CA
- Flight plan: IFR

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; airline transport; airplane ratings: single-engine land, multi-engine land; instrument ratings: airplane; medical: class 1, valid medical--no waivers/lim.; seat: left

## Weather

- Conditions: Visual (VMC), Day
- Wind: 160° at 7 knots
- Visibility: 20 statute miles
- Lowest ceiling: 10,000 ft broken
- Temperature: 82 °F, dew point 57 °F
- Altimeter: 30.00 inHg
- Observed at: MSP, 5 nm away

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.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.