# N990UA: 1979 Boeing 737-291, registration cancelled 2003-06-12

- Type: Cancelled registration (FAA registry, deregistered aircraft)
- Cancelled: June 12, 2003
- Status when cancelled: Triennial form not returned
- Airframe: [Boeing 737-291](https://openairdocs.org/model/boeing-737-291) (registry code 138448W)
- Engine: [Pratt & Whitney JT8D-17 series](https://openairdocs.org/engine/pratt-whitney-jt8d-17-series) (registry code 52049)
- Data sheets: [TCDS A16WE](https://openairdocs.org/tcds/A16WE), [TCDS E2EA](https://openairdocs.org/tcds/E2EA) (OpenAirDocs)
- Serial number: 21980
- Year built: 1979
- Type of aircraft: Fixed wing multi engine
- Engine type: Turbo-jet
- Airworthiness: Standard, transport
- Airworthiness date: September 21, 1979
- Certificate issued: November 21, 1995
- Last registry action: December 18, 2001
- Mode S code: ADD466
- Owner when cancelled: [United Air Lines Inc](https://openairdocs.org/faa-owner/UNITED%20AIR%20LINES%20INC)
- Location: [Elk Grove Township, IL](https://openairdocs.org/faa-place/IL/Elk%20Grove%20Township)
- Owner type: Corporation
- Owner's area on the map: 42.0240° N, 87.9995° W: Placed by OpenAirDocs at the center of ZIP code 60007, within about 2 miles (OpenAirDocs). The owner's mailing address, not where the aircraft was based
- The mark today: https://openairdocs.org/aircraft/N990UA
- FAA registry: https://registry.faa.gov/AircraftInquiry/Search/NNumberResult?nNumberTxt=990UA
- Page: https://openairdocs.org/deregistered/N990UA-2003-06-12

From the FAA registry file of November 12, 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 737-291: https://openairdocs.org/model/boeing-737-291.md

## Service difficulty reports (10)

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

- [SDR 2001UALA01481](https://openairdocs.org/sdr/2001UALA01481), Jul 26, 2001: STRINGER CLIP. DAMAGED. STRINGER CLIP DAMAGED, AT BS500B, STR1L. REPLACED STRINGER CLIP. MAJOR REPAIR ACCOMPLISHED.
- [SDR 2001UALA01477](https://openairdocs.org/sdr/2001UALA01477), Jul 25, 2001: DOOR FRAME. DAMAGED. FWD CARGO DOOR FRAME DAMAGED AT LOWER FORWARD CORNER. REPLACED FRAME. MAJOR REPAIR ACCOMPLISHED.
- [SDR 99UAL900652](https://openairdocs.org/sdr/99UAL900652), Dec 17, 1999: WARNING LIGHT. ILLUMINATED. THE CREW REPORTED THE 'A' HYDRAULIC SYSTEM QUANTITY INDICATION OF 1.9 GALLONS ALONG WITH THE ILLUMINATION OF THE LOW QUANTITY LIGHT FOR THE STANDBY HYDRAULIC SY
- [SDR 99UAL900213](https://openairdocs.org/sdr/99UAL900213), Apr 15, 1999: ENGINE. FAILED. NR 1 ENGINE EGT LIMIT EXCEEDED, HIGH OIL PRESSURE AND HIGH OIL TEMPERATURE. *S/D* THE THROTTLE LINKAGE BECAME DETACHED AND NORMAL ENGINE VIBRATION CAUSED THE TH
- [SDR 99UAL900069](https://openairdocs.org/sdr/99UAL900069), Feb 2, 1999: VALVE. FAILED. LOST A SYSTEM HYDRAULIC QUANTITY AND PRESSURE AFTER GEAR EXTENSION AND DURING FLAP OPERATION. *S/D* FOUND THE FLAP FLOW LIMITING VALVE LEAKING. THIS UNIT WAS LE
- [SDR 98UAL900587](https://openairdocs.org/sdr/98UAL900587), Dec 6, 1998: OIL LINE. CRACKED. NUMBER TWO ENGINE HAD LOW OIL PRESSURE. *S/D* THE NR 6 BEARING OUTER INTERNAL OIL PRESSURE LINE HAD CRACKED AT THE BRAZE JOINT NEAR THE 'B' NUT CONNECTION, CAUS
- [SDR 97UAL900272](https://openairdocs.org/sdr/97UAL900272), Apr 7, 1997: ACTUATOR LUG. BROKEN. RT MLG ACTUATOR O/B ATTACH LUG WAS FOUND BROKEN IN HALF. THE HALF THAT WAS BROKEN OFF WAS IN TWO SECTIONS AND WAS FOUND TRAPPED IN A SEAL RETAINER IN THE LOWER 
- [SDR 96UAL900911](https://openairdocs.org/sdr/96UAL900911), Nov 27, 1996: BOOST PUMPS. FAILED. AFTER TAKEOFF, NUMBER ONE ENGINE FORWARD AND AFT LOW PRESSURE LIGHTS ILLUMINATED. CIRCUIT BREAKERS WERE FOUND POPPED, RETURNED TO DEN. *S/D* REPLACED FWD AND AF
- [SDR 96UAL900697](https://openairdocs.org/sdr/96UAL900697), Sep 13, 1996: INDICATOR. INOPERATIVE. FLAPS WOULD NOT EXTEND DURING APPROACH,TRIED MULTIPLE TIMES AND THEY FINALLY EXTENDED AFTER THE SIXTH TRY. AFTER LANDING FLAPS WOULD NOT RETRACT. *S/D* REPLACED
- [SDR 95UAL900199](https://openairdocs.org/sdr/95UAL900199), Oct 12, 1995: THROTTLE CRANK. LOOSE. CREW REPORTS NR 2 ENGINE WILL NOT REDUCE FROM CRUISE POWER SETTING WITH THROTTLE AT IDLE. ENGINE SHUTDOWN FOR LANDING AT SLC DUE TO NO RESPONSE FROM THROTTLE. F

## 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 BFO90LA043](https://openairdocs.org/ntsb/BFO90LA043), May 11, 1990: Boeing B-737 (N990UA), Washington, DC, no damage. Probable cause: THE AIRCRAFT ENCOUNTERED TURBULENCE, RESULTING IN INJURY TO A FLIGHT ATTENDANT.

## FAA accident and incident reports (1)

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.

- [Accident 19900511042579A](https://openairdocs.org/incident/19900511042579A), May 11, 1990: Boeing 737291 (N990UA), Washington, DC. Encounteered unforecast clear air turbulence on descent. A flight attendant was seriously injured.

## Other aircraft with N990UA

- [Cancelled 2022-02-05](https://openairdocs.org/deregistered/N990UA-2022-02-05): Unmanned Ad-Hoc Industries HIGH ENDURANCE FOLD, S/N HEFF 002. Registration expired, pending cancellation. Owner: [Unmanned Ad-Hoc Industries Inc](https://openairdocs.org/faa-owner/UNMANNED%20AD-HOC%20INDUSTRIES%20INC), [Spring, TX](https://openairdocs.org/faa-place/TX/Spring)

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