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Cases › DFW08IA087 · Part 121 airline

BOEING 737-524Continental Airlines Inc

Houston, TX, USA · 2008-03-27·N23661

0
fatal
0
serious
No injury
highest injury
Minor
damage
Replay the flight data2,727 samples · 19 parametersSRN 619,280 – SRN 619,380Replay the flight data2,550 samples · 22 parametersSRN 614,280 – SRN 614,380Replay the flight data2,550 samples · 22 parametersSRN 619,280 – SRN 619,380AnalyseThe analystOne timeline · precedents · ask the docket · what the record saysGenerateInvestigation briefFacts, cause, recorder extremes, sequence, sourcesSourceNTSB docket8 documents on data.ntsb.gov

What happened

NTSB summary, verbatim

The flight crew departed for the destination airport knowing that the anti-skid system was inoperative. While in flight the flight crew briefed the operational procedures for landing with an inpoerative anti-skid system, including manual deployment of the speed brakes and thrust reversers before using minimal braking during the landing to avoid tire blowout. During the landing the flight crew encountered four blown main landing gear tires, resulting in minor damage to the airplane. An examination of the wheels, tires, and brakes revealed no anomalies. Further examination of the airplane and its systems revealed no anomalies aside from the inoperative anti-skid system. The flight data recorder data depicted no deployment of the speed brakes, no use of the thrust reversers, and an increase in brake pressure at the same time weight was transferred to the nose gear, consistent with brake application upon landing.

Photographs

1the aircraft, and what the investigators found
The aircraft before the accident
126an - Continental Airlines Boeing 737-524, N23661@EWR,20.03.2001 - Flickr - Aero Icarus
Aero Icarus from Zürich, Switzerland · CC BY-SA 2.0 · Wikimedia Commons

Probable cause

the Board's determination
The flight crew's improper landing technique for an inoperative anti-skid system resulting in locked brakes and four blown main landing gear tires.

Occurrence sequence

2 stepsNTSB coding · CICTT taxonomy
  1. 1 · Landing-landing roll
    Sys/Comp malf/fail (non-power)
    defining event
  2. 2 · Landing-landing roll
    Attempted remediation/recovery

Findings

1 causal · 1 contributing
  • CAUSE
    Personnel issues › Task performance › Use of equip/info › Use of equip/system — Flight crew
  • FACTOR
    Aircraft › Aircraft systems › Landing gear system › Anti-skid section — Inoperative

Sequence of events

2 timed eventsfrom the FDR factual report · claude-sonnet-5
  1. N/ALandingp.1
    Blew the tires on the right main landing gear while landing in Houston, TX
  2. N/ALandingp.3
    Plot shows data for the 60 seconds before and 40 seconds after the nose landing gear weight-on-wheels switch indicates the nose gear is on the ground

NTSB analysis

from the final report

The flight crew departed for the destination airport knowing that the anti-skid system was inoperative. While in flight the flight crew briefed the operational procedures for landing with an inpoerative anti-skid system, including manual deployment of the speed brakes and thrust reversers before using minimal braking during the landing to avoid tire blowout. During the landing the flight crew encountered four blown main landing gear tires, resulting in minor damage to the airplane. An examination of the wheels, tires, and brakes revealed no anomalies. Further examination of the airplane and its systems revealed no anomalies aside from the inoperative anti-skid system. The flight data recorder data depicted no deployment of the speed brakes, no use of the thrust reversers, and an increase in brake pressure at the same time weight was transferred to the nose gear, consistent with brake application upon landing.