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LAX91GA016 · McDonnell Douglas 369E

23 Oct 1990 · Compton, CA, United States

Los Angeles Sheriff Dept McDonnell Douglas 369E and Compton Police Department Enstrom F-28F · Accident: midair collision en route

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Event

NTSB case
LAX91GA016
Event typeAccident: someone killed or seriously injured, or the aircraft substantially damaged (NTSB definition). Incident: an occurrence that affected or could have affected safety, short of that. Glossary
Accident
InvestigationHow far the investigation had got when the record was published: preliminary, ongoing, final or completed. Unknown where the source does not say. Glossary
Completed
API-reported fatalities
0 · all aircraft and ground
Ground fatalities
0
OperationWhat kind of flying it was, grouped by the rules it flew under: airline (US Part 121), air taxi and commuter (Part 135), general aviation (Part 91 and similar), military or government. Glossary
General aviation
WeatherVisual meteorological conditions (VMC): good enough to fly by looking outside. Instrument conditions (IMC): cloud or low visibility, flying by instruments. Glossary
Visual Meteorological Cond

Aircraft 1 · McDonnell Douglas 369E

Category
Helicopter
RegistrationThe aircraft's tail number, such as N12345 or G-ABCD. Registrations are reissued, so the same one years apart can be a different aircraft. Glossary
N451DS
Onboard fatalities
Unknown
Route
From Carson, CA (no airport)To not recorded
Aircraft age
Not recorded
Flight rulesThe regulations the flight operated under: in the US, Part 91 (general aviation), Part 121 (airlines), Part 135 (air taxi and commuter) and others; for flights abroad, the NTSB's coarser commercial or non-commercial code. Glossary
Part 91: General Aviation
Phase of flightThe stage of the flight when things started to go wrong: standing, taxi, takeoff, initial climb, en route, maneuvering, approach or landing. Glossary
En route · cruise
First occurrenceThe single coded event the NTSB judges best describes what happened (records from 2008 on). Older records name the first occurrence in the sequence instead. Glossary
Midair collision
DamageDestroyed: beyond practical repair. Substantial: damage that affects the structure, performance or handling and normally needs major repair. Minor: less than that. Glossary
Substantial

Aircraft 2 · Enstrom F-28F

Aircraft type
Enstrom F-28
Category
Helicopter
RegistrationThe aircraft's tail number, such as N12345 or G-ABCD. Registrations are reissued, so the same one years apart can be a different aircraft. Glossary
N48HR
Onboard fatalities
Unknown
Route
From Compton Woodley Airport (CPM), Compton, CATo not recorded
Aircraft age
Not recorded
Flight rulesThe regulations the flight operated under: in the US, Part 91 (general aviation), Part 121 (airlines), Part 135 (air taxi and commuter) and others; for flights abroad, the NTSB's coarser commercial or non-commercial code. Glossary
Part 91: General Aviation
Phase of flightThe stage of the flight when things started to go wrong: standing, taxi, takeoff, initial climb, en route, maneuvering, approach or landing. Glossary
Maneuvering
First occurrenceThe single coded event the NTSB judges best describes what happened (records from 2008 on). Older records name the first occurrence in the sequence instead. Glossary
Midair collision
DamageDestroyed: beyond practical repair. Substantial: damage that affects the structure, performance or handling and normally needs major repair. Minor: less than that. Glossary
Substantial

Cause areas

  • Pilot in command › Visual lookout, inadequate
  • Pilot of other aircraft › Visual lookout, inadequate

Approximate · Coordinates as recorded by the NTSB; no uncertainty radius is established.

NTSB narrative

TWO HELICOPTERS WERE BEING USED IN LAW ENFORCEMENT ACTIVITIES. ONE WAS A LOS ANGELES SHERIFF'S DEPT (LASD) MCDONNELL- DOUGLAS 369E, N451DS, CALL SIGN AIR 21. THE OTR WAS A COMPTON POLICE DEPT (CPD) ENSTROM F-28F, N48HR, CALL SIGN AIR 28. WHILE IN THE LAX TCA, AIR 21 RESPONDED TO AN EMERG CALL. AFTER DEPG THE TCA, THE PLT (AIR 21) SWITCHED HIS COM RADIO TO 123.02 MHZ (COMMON FREQ FOR LAW ENFORCEMENT IN THE AREA) & ANNOUNCED HIS PSN. WHEN NO RESPONSE WAS RCVD, HE SWITCHED TO THE COMPTON UNICOM FREQ (122.9 MHZ). AT ABOUT THAT TIME, AIR 28 WAS ORBITING IN THE SAME VCNTY. THE PLT OF AIR 28 SAID HE HAD ANNOUNCED HIS PSN ON 122.9 MHZ (RQRD FREQ IN THE AREA FOR CPD ACFT) & WAS MONITORING 123.02 MHZ. THE 2 CONVERGED & COLLIDED, BUT BOTH REMAINED CONTROLLABLE & WERE LNDD FROM EMERG APCHS. BFR THE MIDAIR, THE PLT OF AIR 21 WAS HELPING HIS OBSERVER LOOK FOR A PSN ON A MAP. HE SAW AIR 28 JUST BFR IMPACT, BUT NOT IN TIME TO AVOID A COLLISION. THE PLT OF AIR 28 HAD HIS TRANSPONDER ON STANDBY, ALTHO HE WAS REQD TO BE OPERG IT, WHILE WITHIN 30 MI OF THE (GROUP 1) TCA.

Probable cause

INADEQUATE VISUAL LOOKOUT BY THE PILOTS OF BOTH AIRCRAFT, WHICH RESULTED IN A FAILURE OF EACH TO SEE-AND-AVOID CONFLICTING TRAFFIC. FACTORS RELATED TO THE ACCIDENT WERE: DARKNESS, FAILURE OF THE PILOT OF AIR 28 (N48HR) TO USE HIS TRANSPONDER NEAR THE TCA, AND THE PILOT OF AIR 21 DIVERTED TOO MUCH OF HIS ATTENTION TO A MAP.

Verbatim NTSB analysis and probable cause from the NTSB dataset

Sources

NTSB record LAX91GA016
Event ID
20001212X24481
Case number
LAX91GA016
Dataset
historical-pre2008
Source SHA-256
89e2df6d848e7ab3b42e7d7c7a03ff403303057a26ca04c95b3ea67201c3ce74
Source notes (4)
  • Unreviewed is an editorial label, not an investigation status. API-sourced is not report-checked or human-reviewed. Explicit event totals are used without summing aircraft injury tables; onboard allocation is withheld. Unknown values remain unknown. The operation category is mapped from the NTSB-reported FAR part and has not been reviewed.
  • Filled from the NTSB case API where the bulk record had no value: local date, investigation status. Values present in the bulk record are kept.
  • The date is the local date; the NTSB stores the UTC date 1990-10-24.
  • API snapshot SHA-256: ec8dff960469d18372ea399b3d52dd219c7a7ef02806687c8b5d6c740b160147; retrieved 2026-09-23T05:12:17.530Z.