ASN Wikibase Occurrence # 370368
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| Date: | Sunday 11 April 2004 |
| Time: | 14:25 LT |
| Type: |  Bombardier CRJ-701ER |
| Owner/operator: | Horizon Air |
| Registration: | N609QX |
| MSN: | 10031 |
| Total airframe hrs: | 5388 hours |
| Engine model: | General Electric CF34-8C1 |
| Fatalities: | Fatalities: 0 / Occupants: 60 |
| Aircraft damage: | None |
| Category: | Serious incident |
| Location: | Denver International Airport, CO (DEN/KDEN) -
 United States of America
|
| Phase: | Approach |
| Nature: | Passenger - Scheduled |
| Departure airport: | Ontario International Airport, CA (ONT/KONT) |
| Denver International Airport, CO (DEN/KDEN) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The captain reported that while in cruise flight at flight level 330, the crew received a master caution light and a hydraulic system 1 low pressure along with warning lights for the outboard ground spoilers, outboard spoilerons, and the outboard spoilers. The hydraulic fluid quantity and fluid temperature readings were good, but the system pressure was dropping. The crew ran the emergency checklist and continued their flight to Denver, using the backup (1B) system. On final approach and landing, the captain reported that they lost number 1 system pressure and quantity. The crew shut off the 1B system and continued to land. After landing, the crew shut down the number one engine and taxied to the gate. A post-incident examination of the airplane's number 1 hydraulic system showed that the hydraulic pump had come apart internally and seized. Metal fragments were found in the hydraulic filters and lines. Further examination of the hydraulic pump showed that several piston shoes in the pump's hanger and piston subassembly had come apart. The resulting metal fragments subsequently caused damage to the hold-down plate, the hanger, and other internal components of the pump, resulting in its seizure.
Probable Cause: The total failure of the airplane's number 1 system hydraulic pump.
Accident investigation:
 |
|
Sources:
NTSB DEN04IA060
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 25-Mar-2024 09:55 | ASN Update Bot | Added |
Corrections or additions? ... Edit this accident description
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