# N4727U: Boeing 747-122, registration cancelled 1998-02-17

- Type: Cancelled registration (FAA registry, deregistered aircraft)
- Cancelled: February 17, 1998
- Status when cancelled: Triennial form not returned
- Airframe: [Boeing 747-122](https://openairdocs.org/model/boeing-747-122) (registry code 1384872)
- Data sheets: [TCDS A20WE](https://openairdocs.org/tcds/A20WE) (OpenAirDocs)
- Serial number: 19883
- Type of aircraft: Fixed wing multi engine
- Certificate issued: August 1, 1972
- Last registry action: September 20, 1995
- Mode S code: A5CBE8
- Owner when cancelled: [United Air Lines Inc](https://openairdocs.org/faa-owner/UNITED%20AIR%20LINES%20INC)
- Location: [Chicago, IL](https://openairdocs.org/faa-place/IL/Chicago)
- Owner type: Corporation
- Owner's area on the map: 41.8500° N, 87.6501° W: Placed by OpenAirDocs: center of Chicago, IL, within about 9 miles (OpenAirDocs). The owner's mailing address, not where the aircraft was based
- The mark today: https://openairdocs.org/aircraft/N4727U
- FAA registry: https://registry.faa.gov/AircraftInquiry/Search/NNumberResult?nNumberTxt=4727U
- Page: https://openairdocs.org/deregistered/N4727U-1998-02-17

From the FAA registry file of November 4, 2026, cancelled registrations. Owners' street addresses are left out. The Mode S code belongs to the N-number, not the airframe.

ADs and bulletins for the Boeing 747-122: https://openairdocs.org/model/boeing-747-122.md

## Service difficulty reports (7)

Matched to this aircraft by N-number and event date, checked against the reported serial number, make and model.

- [SDR 96UAL900566](https://openairdocs.org/sdr/96UAL900566), Jul 23, 1996: PITOT TUBE. PLUGGED. FIRST OFFICER'S AIRSPEED INDICATOR INOPERATIVE. READS ZERO ALL THE TIME. ABORTED TAKEOFF AT 100 KNOTS. PROBLEM CAUSED BY BLOCKED PITOT INPUT. SOURCE OF BLOCKAGE
- [SDR 96UAL900455](https://openairdocs.org/sdr/96UAL900455), Jun 15, 1996: LAMP. INOPERATIVE. NR 1 RIGHT OVERWING FORWARD EMERGENCY LIGHT INOPERATIVE. REPLACED LAMP ASSY AND REPAIRED BROKEN GROUND WIRE.
- [SDR 96UAL900243](https://openairdocs.org/sdr/96UAL900243), Apr 8, 1996: HYD PUMP. LEAKING. RIGHT BODY AND WING GEAR DOORS WOULD NOT CLOSE USING PRIMARY AND ALTERNATE SYSTEM. FAILED NR 4 HYDRAULIC PUMP. FOUND LEAKING PUMP SEAL SHAFT. REPLACED PUMP.
- [SDR 96UAL900209](https://openairdocs.org/sdr/96UAL900209), Mar 21, 1996: HINGE TAPE. TORN. DURING ROUTINE OVERHAUL OF SLIDE, FOUND TORN HINGE TAPE AT LEFT HAND OUTBOARD INTERNAL BULKHEAD. ADDITIONALLY FOUND BULKHEAD SEPARATION EXTENDING APPROXIMATELY 
- [SDR 96UAL900167](https://openairdocs.org/sdr/96UAL900167), Mar 5, 1996: SLIDE. FAILED TEST. SLIDE FAILED AIR RETENTION TEST DURING OVERHAUL. AIR RETENTION FAILED DUE TO SLIDE POROSITY. SLIDE SCRAPPED.
- [SDR 95UAL900169](https://openairdocs.org/sdr/95UAL900169), Oct 4, 1995: TRUNNIONS. REQD SERVICE. LEFT WING GEAR DOOR REMAINED DOWN UPON GEAR RETRACTION, GEAR DID NOT FULLY RETRACT. LEFT WING GEAR FORWARD AND AFT TRUNNIONS WERE DISASSEMBLED AND REASSEMBLED P
- [SDR 95UAL747017](https://openairdocs.org/sdr/95UAL747017), Mar 15, 1995: FIRE WARNING. ACTIVATED. NR 1 ENGINE FIRE WARNING SOUNDED AFTER LIFT OFF. PULLED FIRE HANDLE, SHUT DOWN ENGINE. FIRE WARNING LIGHT WENT OUT.

## NTSB investigations (1)

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.

- [NTSB DEN78FI014](https://openairdocs.org/ntsb/DEN78FI014), Oct 12, 1977: Boeing 747 (N4727U), Denver, CO, incident, no damage

## FAA accident and incident reports (5)

From the FAA Accident/Incident Data System. Reports are matched to registry aircraft by N-number and event date, checked against the reported make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model.

- [Incident 19900815049449I](https://openairdocs.org/incident/19900815049449I), Aug 15, 1990: Boeing 747122 (N4727U), Honolulu, HI. Loss of oil on NR1 engine. Shut down and headed for Honolulu without clearance. Aft seal had failed.
- [Incident 19830521028699I](https://openairdocs.org/incident/19830521028699I), May 21, 1983: Boeing 747122 (N4727U), Chicago, IL, Minor damage. Blew a tire on takeoff. Continued to destination. Replaced no. 5 and no. 6 tires.
- [Incident 19800910082649I](https://openairdocs.org/incident/19800910082649I), Sep 10, 1980: Boeing 747122 (N4727U), Honolulu, HI. Flight attendant struck on the head by overhead bin door. Latch was faulty, and bin was overloaded.
- [Incident 19800505050759I](https://openairdocs.org/incident/19800505050759I), May 5, 1980: Boeing 747122 (N4727U), Chicago, IL. Aircraft returned to gate due to anti-skid inop. Light on. Number 5 front brake anti-skid found inop.
- [Incident 19790914035389I](https://openairdocs.org/incident/19790914035389I), Sep 14, 1979: Boeing 747122 (N4727U), Chicago, IL. Aircraft returned to field with hydraulic flap problem. Due to failed right outboard flap system transmitter.

## Other aircraft with N4727U

- [Cancelled 1964-07-23](https://openairdocs.org/deregistered/N4727U-1964-07-23): Cessna 180G, S/N 18051427. Exported to Australia. Owner: [Cessna Aircraft Co](https://openairdocs.org/faa-owner/CESSNA%20AIRCRAFT%20CO), [Wichita, KS](https://openairdocs.org/faa-place/KS/Wichita)

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