# NTSB LAX85IA297: Boeing 737-247, N473AC, Los Angeles, CA, June 27, 1985

- Type: NTSB incident investigation
- Classification: Incident · No injuries · Incident investigation · Final report
- Date: June 27, 1985, 15:32 local (22:32 UTC)
- Place: Los Angeles, CA
- Location: 34.0522° N, 118.2437° W: Placed by OpenAirDocs: center of Los Angeles, CA, within about 12 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=34.0522&lon=-118.2437&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 96 uninjured
- Status: Completed
- Report: Approved by Office Director
- NTSB case key (mKey): 24562
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=LAX85IA297
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/24562/pdf
- Page: https://openairdocs.org/ntsb/LAX85IA297

## Sequence of events

In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf).

- Airframe/component/system failure/malfunction, cruise - normal
  - hydraulic system,shutoff valve - switched off
  - inattentive, pilot in command
  - hydraulic system,seal - separation
  - hydraulic system,pump - fatigue
  - flt control syst,wing flap control - inoperative

## Analysis

THE CAPTAIN STATED THAT THE 'B' HYDRAULIC SYSTEM LOW OIL LEVAL LAMP ILLUMINATED WHILE THE ACFT WAS IN CRUISE FLT. AS HE COMPLETED THE FAILURE CHECK AND PLACED THE 'B' SYSTEM INTO STANDBY RUDDER CONDITION THAT PROVIDES HYDRAULIC PRESSURE TO ONLY THE RUDDER, THE 'A' HYDRAULIC SYSTEM FAILED. THE FLIGHTCONTINUED TO IT'S DESTINATION AND WHEN THE CREW WAS UNABLE TO LOWER THE TRAILING EDGE FLAPS, DUE TO ANOTHER MALFUNCTION, LANDED WITHOUT INCIDENT.

## Aircraft

- Registration: N473AC (not matched to a registry record)
- Reported make and model: BOEING 737-247
- Category: Airplane
- Serial number: 19614
- Engines: P&W JT80 14500 lbs thrust turbo fan
- Damage: Minor damage
- Flight: Part 121
- Registered owner: Air Cal
- Airworthiness certificate: Standard, Transport
- Departed: SFO, SAN FRANCISCO, CA
- Destination: LAX, LOS ANGELES, CA
- Flight plan: IFR
- Airport: LAX, Los Angeles Intl, runway 25L, 1,196 × 200 ft, concrete

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 51; airline transport, flight instructor; airplane ratings: multi-engine land, single-engine land; instrument ratings: airplane; medical: class 1, valid medical--w/ waivers/lim; seat: left; flight hours: 11,532 total, 4,075 in this make and model, 10,612 as pilot in command, 208 in the last 90 days, 71 in the last 30 days, 7 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: 250° at 9 knots
- Visibility: 4 statute miles
- Lowest ceiling: none
- Temperature: 72 °F, dew point 59 °F
- Altimeter: 29.00 inHg
- Observed at: LAX

From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model.

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