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NTSB Report
May 11, 1985 · Boeing B767-232 · N108DL
D/Fw Airport, TX
Overview
Report Status
Preliminary report
Event Type
Incident
Date
May 11, 1985
Injury Outcomes
No injuries (53 uninjured)
Location
D/Fw Airport, TX
Aircraft
Boeing B767-232
Tail Number
N108DL
Injuries
None
Aircraft Damage
Minor
NTSB Number
FTW85IA221
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
Full Narrative
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
Flight
Event TypeIncident
Event Time17:05 CDT
Nearest AirportDfw Airport (0nm N)
Runway17L
Runway Length11387 ft
Runway Width150 ft
Flight Plan FiledIFR
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftBoeing B767-232
Tail NumberN108DL
Aircraft CategoryAir
DamageMinor
Operating RulePart 121
Engines2
Engine TypeTurbofan
Engine DetailsGe · CF6-80A · Turbofan · 30000
Seats255
People & Injuries
Injury SummaryNo injuries (53 uninjured)
Fatal0
Serious0
Minor0
Uninjured53
Total53
Crew 1Unknown
Conditions
ConditionsVMC
LightDaylight
Wind180° @ 15 kt
Visibility8 sm
CeilingBroken clouds 6000 ft
Temperature / Dew Point70 F
Altimeter29.00 inHg
Observation Time22:00
Weather SourceWFAC