Airprox Serious incident Boeing 727-222 N7255U, Wednesday 29 October 1986
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Date:Wednesday 29 October 1986
Time:12:09 LT
Type:Silhouette image of generic B722 model; specific model in this crash may look slightly different    
Boeing 727-222
Owner/operator:United Airlines
Registration: N7255U
MSN: 21402/1313
Year of manufacture:1977
Engine model:P&W JT8D-15
Fatalities:Fatalities: 0 / Occupants: 2
Other fatalities:0
Aircraft damage: None
Category:Serious incident
Location:Los Angeles, CA -   United States of America
Phase: Approach
Nature:Passenger - Scheduled
Departure airport:Monterey, CA (MRV)
Destination airport:Los Angeles International Airport, CA (LAX/KLAX)
Investigating agency: NTSB
Confidence Rating: Accident investigation report completed and information captured
Narrative:
DRG ARR, UNITED FLT 282 (BOEING 727, N7255U) WAS VECTORED BY LOS ANGELES (LAX) TRACON FOR AN ILS RWY 25L APCH. WHILE IN A DSCNDG TURN AT 2100' MSL TO INTERCEPT THE ILS LOC AT 2000', THE CAPT SAW A HELICOPTER (HEL) AHEAD & PULLED UP. HE ESTD HIS ACFT PASSED W/I 200' TO 300' OF THE HEL. THE HEL WAS A DEA ACFT (HUGHES 369D, N8620F) ON A SURVEILLANCE FLT. THE DEA PLT SAID HE WAS HOVERING BLO THE LAX TERMINAL CTL AREA (TCA) WHEN HE SAW THE BOEING MAKE A RGT TURN TWD THE LAX ARPT. HE SAID THE BOEING WAS IN HIS VIEW FOR THE ENTIRE TIME & IT WAS NOT A HAZARD TO HIM, BUT HE WAS CONCERNED ABOUT ITS LOW ALT. LATER, HE ADZD LAX TWR. THE DEA PLT STATED HE WAS OPERG BTN 1400' & 1900' & THAT THE HEL WAS AT 1300' WHEN THE BOEING CONVERGED. HE ESTD THE BOEING CROSSED 300' TO 400' ABV THE HEL. RADAR DATA INDCD THE 2 ACFT CONVERGED TO A SLANT RANGE OF 1500'. MIN VERT SEPN WAS 200'. RADAR DATA ALSO INDCD THAT FLT 282 REMAINED ABV THE TCA FLOOR (2000') & THAT THE HEL WAS BLO THE TCA. A LEAK WAS FND IN THE HEL'S PITOT STATIC SYS, WHICH CAUSED AN UNDETERMINED ERROR.


Findings
1. (C) FLIGHT/NAV INSTRUMENTS,ALTIMETER - LEAK
2. (C) ALTITUDE - EXCESSIVE - PILOT OF OTHER AIRCRAFT

Accident investigation:
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Investigating agency: NTSB
Report number: LAX87IA027
Status: Investigation completed
Duration: 1 year and 8 months
Download report: Final report

Sources:

NTSB LAX87IA027

Revision history:

Date/timeContributorUpdates
27-Mar-2024 19:40 ASN Update Bot Added
31-Mar-2024 12:38 ASN Updated [Cn, Nature, Departure airport, Destination airport, Narrative, ]

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