# NTSB FTW85IA221: Boeing B767-232, N108DL, D/Fw Airport, TX, May 11, 1985

- Type: NTSB incident investigation
- Classification: Incident · No injuries · Incident investigation · Final report
- Date: May 11, 1985, 17:05 local (22:05 UTC)
- Place: D/Fw Airport, TX
- Location: 32.8972° N, 97.0377° W: Placed by OpenAirDocs at DALLAS-FORT WORTH INTL (DFW), within about a mile (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=32.8972&lon=-97.0377&mi=10
- Phase of flight: [Initial climb](https://openairdocs.org/ntsb-phases/350) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 53 uninjured
- Status: Completed
- Report: Approved by Office Director
- NTSB case key (mKey): 21592
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=FTW85IA221
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/21592/pdf
- Page: https://openairdocs.org/ntsb/FTW85IA221

## Sequence of events

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

- Explosion, takeoff - initial climb
  - air cond/heating/pressurization - failure,total (cause)
  - pneumatic system - failure,total (cause)
  - air cond/heating/pressurization,pressure regulator - failure,total (cause)
  - pneumatic system - pressure excessive (cause)
  - throttle/power lever,cable - inoperative (cause)
  - throttle/power lever,cable - separation (cause)
- Forced landing, landing

## Analysis

THE B767 WAS ON THE TAKEOFF ROLL. THE PRESSURE REGULATOR AND SHUTOFF VALVE COUPLED WITH THE HIGH PRESURE SHUTOFF VALVE MALFUNCTIONED RESULTING IN PRESSURES BEING DEVELOPED IN THE DOWNSTREAM AIRCRAFT DUCTING IN EXCESS OF 300 PSIG. A COUPLING IN THE AIR CONDITIONING PACK BAY SEPARATED ALLOWING THE DUCTING TO COME APART DUE TO THE EXCESS PRESSURE WITH SUFFICIENT FORCE TO TEAR LOOSE DUCT SUPPORTS, CRACK FAIRING PANELS, SEVER BOTH RH ENGINE THROTTLE CABLES, BREAK ACTUATING LINKAGE FOR THE LEADING EDGE SLAT DRIVE, BLOW OPEN RH PACK BAY DOOR AND CAUSE A SECTION OF DUCTING CONTAINING THE CENTER ISOLATION VALVE TO DEPART FROM THE AIRCRAFT. MINOR DAMAGE OCCURRIED TO THE AIR CRAFT STRUCTURE

## Aircraft

- Registration: [N108DL](https://openairdocs.org/deregistered/N108DL-2006-09-27), registration cancelled 2006-09-27, S/N 22220, built 1982 (OpenAirDocs)
- Reported make and model: BOEING B767-232
- Registry model: [Boeing 767-232](https://openairdocs.org/model/boeing-767-232) (registry code 1385132) (OpenAirDocs)
- Registry engine: [GE CF6-80 series](https://openairdocs.org/engine/ge-cf6-80-series) (registry code 30025, turbo-fan) (OpenAirDocs)
- Category: Airplane
- Serial number: 22220
- Airframe hours: 6535
- Engines: GE CF6-80A 30000 lbs thrust turbo fan
- Damage: Minor damage
- Flight: Part 121
- Registered owner: Delta Airlines Inc.
- Airworthiness certificate: Standard, Transport
- Departed: DFW, DALLAS FT.WORTH, TX
- Destination: LGA, NEW YORK, NY
- Flight plan: IFR
- Airport: DFW, Dfw Airport, runway 17L, 11,387 × 150 ft, asphalt

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; airline transport; airplane ratings: multi-engine land; instrument ratings: airplane; medical: unknown, unknown; seat: left; flight hours: 18,000 total, 1,600 in this make and model

## Weather

- Conditions: Visual (VMC), Day
- Wind: 180° at 15 knots
- Visibility: 8 statute miles
- Lowest ceiling: 6,000 ft broken
- Temperature: 77 °F, dew point 70 °F
- Altimeter: 29.00 inHg
- Observed at: DFW

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.

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