Status:	Final
Date:	08 AUG 1973
Time:	14:33
Type:	Boeing 727-171C
Operator:	Braniff International Airways
Registration:	N1728T
C/n / msn:	19860/599
First flight:	1968-06-27 (5 years 1 months)
Engines:	3 Pratt & Whitney JT8D-9A
Crew:	Fatalities: 0 / Occupants: 6
Passengers:	Fatalities: 0 / Occupants: 75
Total:	Fatalities: 0 / Occupants: 81
Airplane damage:	Substantial
Airplane fate:	Repaired
Location:	near Washington, DC (United States of America)
Phase:	En route (ENR)
Nature:	Domestic Scheduled Passenger
Departure airport:	Washington-Dulles International Airport, DC (IAD/KIAD), United States of America
Destination airport:	New York (unknown airport), NY, United States of America

Narrative:
About 15 minutes after takeoff the crew heard a loud bang. Both hydraulic systems and cabin pressure were lost, so the crew declared an emergency and returned to Washington. The landing gear was lowered manually, but the right main gear did not indicate down and locked. An emergency landing on a foamed runway was carried out. Investigation revealed that a damaged wheel lock-out deboost valve caused the brake of the right main gear to drag. The number 4 tyre caught fire and blew out during flight.

PROBABLE CAUSE(S):
personnel - maintenance,servicing,inspection: inadequate maintenance and inspection
airframe - landing gear: braking system (normal system)
miscellaneous acts,conditions - improper clearance-tolerance
miscellaneous acts,conditions - fire in brakes,wheel assembly,wheel well
FACTOR(S):
miscellaneous acts,conditions - landed on foamed runway

Events:

Sources:
» NTSB