# NTSB Incident LAX90IA305
> **BOEING 747-422** · 1990-08-27 · LOS ANGELES, CA, USA · MINR
## Event
- **NTSB number:** LAX90IA305
- **Event ID:** 20001212X24039
- **Type:** Incident
- **Date:** 1990-08-27
- **Location:** LOS ANGELES, CA, USA
- **Coordinates:** 33.950046, -118.400817
## Injuries
- **Highest injury:** MINR
- **Fatal:** 0
- **Serious:** 0
- **Minor:** 23
- **Uninjured:** 320
- **Total aboard:** 345
## Aircraft
- **Make:** BOEING
- **Model:** 747-422
- **Registration:** N174UA
- **FAR Part:** 121
- **Engines:** 4
- **Damage:** MINR
## Conditions
- **Light:** DAYL
- **Weather:** VMC
## Probable cause

THE FAILURE OF THE MANUFACTURER TO ENSURE THAT THE LANDING GEAR SELECTOR VALVES AND THEIR ASSOCIATED DRUM LINK ASSEMBLIES WERE PROPERLY INSTALLED PRIOR TO DELIVERY OF THE AIRCRAFT. A FACTOR IN THE ACCIDENT WAS THE LACK OF INFORMATION AVAILABLE TO THE CREW CONCERNING THE SECONDARY ALTERNATE GEAR EXTENSION PROCDURE.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=LAX90IA305) · AI Analytics · CC0 1.0*