NTSB Identification: LAX87IA027A.
The docket is stored on NTSB microfiche number 37187.
Scheduled 14 CFR UNITED AIRLINES
Incident occurred Wednesday, October 29, 1986 in LOS ANGELES, CA
Probable Cause Approval Date: 07/19/1988
Aircraft: BOEING 727-222, registration: N7255U
Injuries: 73 Uninjured.

NTSB investigators used data provided by various sources and may not have traveled in support of this investigation to prepare this aircraft incident report.

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 ESTDHIS ACFT PASSED W/I 200' TO 300' OF THE HEL. THE HEL WAS A DEA ACFT (HUGHES 369D, N8620F) ON A SURVEILLANCE FLT. THE DEAPLT 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.

The National Transportation Safety Board determines the probable cause(s) of this incident to be:

FLIGHT/NAV INSTRUMENTS,ALTIMETER..LEAK

The National Transportation Safety Board determines the probable cause(s) of this incident to be:

ALTITUDE..EXCESSIVE..PILOT OF OTHER AIRCRAFT

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