FOR IMMEDIATE RELEASE: July 30, 1996 SB 96-18/6579A
NTSB URGES TIGHTER AIRCRAFT REPAIR STATION RULES,
UPDATED COCKPIT VOICE RECORDERS ON ALL PLANES
FOLLOWING 1995 ATLANTA VALUJET ENGINE ACCIDENT
(Washington, DC) -- The National Transportation Safety Board (NTSB)
is urging the Federal Aviation Administration (FAA) to tighten rules for
aircraft repair stations, both in the United Sates and abroad, and to upgrade
the sound quality of cockpit voice recorders in all airplanes.
The NTSB recommendations stem from the investigation of a ValuJet accident
that occurred in Atlanta on June 8, 1995.
At a public meeting in Washington, DC, the NTSB concluded that the ValuJet
DC-9 suffered an uncontained engine failure because a Turkish-based aviation
maintenance and overhaul company did not properly inspect a 7th stage engine
compressor disk. The engine was bought by ValuJet in 1994 from the Turk
Hava Yollari repair station and placed on the DC-9. The failure to catch
the detectable disk crack allowed the crack to grow to a length at which
the disk ruptured, the Board concluded.
ValuJet flight 597, destined for Miami, Florida, was on its takeoff
roll from Hartsfield Atlanta International Airport when the engine failed.
Shrapnel from the failed engine penetrated the fuselage and the right engine
main fuel line. A cabin fire erupted destroying the aircraft. One flight
attendant was seriously injured from shrapnel and the fire. Another flight
attendant and six passengers received minor injuries. None of the other
55 people on board were injured.
Contributing to the failure to detect the disk crack, the Safety Board determined, was that the Turkish repair station did not have an adequate recordkeeping system. It did not use "process sheets" to document step-by-step overhaul and inspection procedures.
As a result of its investigation, the Safety Board issued 12 recommendations
to the FAA.
The NTSB urged the FAA to review the licenses and operations specifications
of all repair stations to make sure that the authority to repair and overhaul
aircraft and aircraft parts is clearly spelled out. The NTSB also called
for more stringent recordkeeping requirements for all FAA-approved repair
stations.
As part of its investigation, the NTSB also uncovered problems with
flammable materials used in the aircraft's interior, flight attendant emergency
training, the public address system and a lack of a clear cockpit voice
recording from the DC-9 that burned.
To correct the shortcomings, the NTSB wants the FAA to require that
all aircraft be equipped with upgraded cockpit voice recorders within two
years. The Board said that all CVRs should include uninterrupted recordings
from boom and mask microphones and headphones for each crewmember's position
and from an area microphone. Those recordings should be made on dedicated
CVR channels. The recommendation also urges the FAA to require that all
audio signals received by hand-held microphones be recorded on the crewmember's
CVR channel when keyed to the "on" position.
The NTSB also urged the FAA to require that older aircraft have their
cabins upgraded with materials that meet current flammability standards
when the aircraft's interior is replaced or when an aircraft is transferred
from one carrier to another.
In addition, the NTSB wants the FAA to require that transport-category
aircraft built before November 1990 be retrofitted with public address
systems capable of operating on independent power sources; emphasize that
FAA principal operations inspectors thoroughly review flight attendant
training programs before approving them; require that all flight attendants
have cockpit keys while on duty; and recommend that crew uniforms conform
with FAA safety guidance for airline passenger attire.
The Safety Board's complete printed report, PB96-910403, will be available
from the National Technical Information Service, 5285 Port Royal Road,
Springfield, VA 22161. The NTIS telephone number is (703) 487-4650.
Media contact: Pat Cariseo (202) 314-6100
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