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Cases › WPR10IA256 · Part 121 airline

BOMBARDIER INC CL-600-2B19SKYWEST AIRLINES INC

Ontario, CA, USA · 2010-05-23·N925SW

0
fatal
0
serious
No injury
highest injury
Minor
damage
AnalyseThe analystOne timeline · precedents · ask the docket · what the record saysGenerateInvestigation briefFacts, cause, recorder extremes, sequence, sourcesSourceNTSB docket11 documents on data.ntsb.gov

What happened

NTSB summary, verbatim

After the pilots extended the airplane’s landing gear in preparation for landing, they observed an unsafe nose landing gear indication and performed a go-around to try to correct the situation. The pilots followed the emergency procedures in the operator’s Quick Reference Handbook but were unable to lower the nose landing gear. The pilots then performed a low-level flyby so air traffic control tower (ATCT) and ground personnel could evaluate the condition of the nose landing gear. When ATCT and ground personnel confirmed that the landing gear doors were open and the nose landing gear remained retracted, the pilots decided to make an emergency landing with the nose landing gear retracted. After the main landing gear touched down, the captain held the nose off the ground as long as possible, in accordance with company procedures. The airplane slid about 2,000 feet after the nose settled to the runway before coming to a stop. During the recovery process, the nose landing gear was extended. Postaccident examination revealed no abnormalities that would have precluded normal operation of the nose landing gear system.

Probable cause

the Board's determination
Failure of the airplane’s nose landing gear to extend for undetermined reasons.

Occurrence sequence

2 stepsNTSB coding · CICTT taxonomy
  1. 1 · Landing
    Sys/Comp malf/fail (non-power)
    defining event
  2. 2 · Landing
    Landing gear not configured

Findings

2 causal · 0 contributing
  • CAUSE
    Aircraft › Aircraft systems › Landing gear system › Nose/tail landing gear — Malfunction
  • CAUSE
    Not determined › Not determined › (general) — Unknown/Not determined

Sequence of events

6 timed eventsfrom the FDR factual report · claude-sonnet-5
  1. N/ALandingp.1
    Emergency landing with the nose gear retracted at Ontario International Airport in Ontario, California
  2. N/AApproachp.8
    First attempt to lower the gear (Initial Gear Extension)
  3. N/AApproachp.9
    Second attempt to lower the gear (Second Gear Extension)
  4. N/AApproachp.10
    Third attempt to lower the gear (Third Gear Extension)
  5. N/AApproachp.11
    Fourth attempt to lower the gear (Fourth Gear Extension)
  6. N/ALandingp.12
    Landing with nose gear retracted

NTSB analysis

from the final report

After the pilots extended the airplane’s landing gear in preparation for landing, they observed an unsafe nose landing gear indication and performed a go-around to try to correct the situation. The pilots followed the emergency procedures in the operator’s Quick Reference Handbook but were unable to lower the nose landing gear. The pilots then performed a low-level flyby so air traffic control tower (ATCT) and ground personnel could evaluate the condition of the nose landing gear. When ATCT and ground personnel confirmed that the landing gear doors were open and the nose landing gear remained retracted, the pilots decided to make an emergency landing with the nose landing gear retracted. After the main landing gear touched down, the captain held the nose off the ground as long as possible, in accordance with company procedures. The airplane slid about 2,000 feet after the nose settled to the runway before coming to a stop. During the recovery process, the nose landing gear was extended. Postaccident examination revealed no abnormalities that would have precluded normal operation of the nose landing gear system.