N77539
Registered owner: UNITED AIRLINES INC, IL (owner ≠ operator)
Operators of this aircraft
Who operated this tail, and how firmly we know it.
No operator established for this aircraft.
Accident & incident history
No NTSB accidents or incidents on file for this aircraft.
Maintenance disclosures
Service Difficulty Reports filed with the FAA for this airframe. Filing is largely voluntary — the number of reports is not a measure of reliability. To verify a report, search its control number at the FAA SDRS site.
31 reports on file, 2022-12-02 – 2026-08-13.
Part: BATTERY PACK — FAULTED (ZONE 200) · airframe 27,357 hrs · 10,366 cycles
EMERGENCY LIGHT BATTERY PACK M1671 HAS LOW VOLTAGE. REMOVED AND REPLACED EMERGENCY LIGHT BATTERY PACK AND OPS CHKD GOOD IAW AMM 33-51-06-960-805.
Part: BATTERY PACK — FAULTED (ZONE 200) · airframe 27,357 hrs · 10,366 cycles
EMERGENCY LIGHT BATTERY PACK M1676 HAS LOW VOLTAGE. REMOVED AND REPLACED EMERGENCY LIGHT BATTERY PACK M1676. OPS CHKD GOOD IAW AMM 33-51-06-960-805.
Part: BATTERY PACK — FAULTED (ZONE 200) · airframe 27,357 hrs · 10,366 cycles
EMERGENCY LIGHT BATTERY PACK M1670 HAS LOW VOLTAGE. REMOVED AND REPLACED EMERGENCY LIGHT BATTERY PACK M1670. OPS CHKD IAW AMM 33-51-06-960-805.
Part: BATTERY PACK — FAULTED (ZONE 200) · airframe 27,357 hrs · 10,366 cycles
EMERGENCY LIGHT BATTERY PACK M1695 HAS LOW VOLTAGE. REMOVED AND REPLACED EMERGENCY LIGHT BATTERY PACK M1695 AND OPS CHKD GOOD IAW AMM 33-51-06-960-805.
Part: BATTERY PACK — FAULTED (ZONE 200) · airframe 27,357 hrs · 10,366 cycles
EMERGENCY LIGHT BATTERY PACK M2335 HAS LOW VOLTAGE. REMOVED AND REPLACED EMERGENCY LIGHT BATTERY PACK M2335 AND OPS CHKD GOOD IAW AMM 33-51-06-960-805.
Part: BATTERY PACK — FAULTED (ZONE 200) · airframe 27,357 hrs · 10,366 cycles
EMERGENCY LIGHT BATTERY PACK M1694 HAS LOW VOLTAGE. REMOVED AND REPLACED EMERGENCY LIGHT BATTERY PACK M1694 AND OPS CHECKED GOOD IAW AMM 33-51-06-960-805.
Part: PLATE — CORRODED (ZONE 100) · corrosion level 2 · airframe 27,357 hrs · 10,366 cycles
LOWER TCAS ANTENNA MOUNTING SURFACE SKIN HAD GOUGES AND CORROSION. REMOVED AND REPLACED ADAPTER PLATE IAW DWG 141A3501, REV- AND SRM 51-40-02. RESTORED PROTECTIVE TREATMENT IAW AMM 51-21-99.
Part: PRESSURE DECK — DENTED (COCKPIT) · airframe 27,357 hrs · 10,366 cycles
B737-MP-2000-53-340-00: FLIGHT DECK ENTRY FLOOR HAS A DENT. REMOVED DAMAGE, HFEC HOLES AND AREA, NO DEFECTS NOTED, FABRICATED, LOCATED AND INSTALLED REPAIR, RESTORED COATINGS IAW UAL ECRA 5315-01235 REV- AND AAR GSO REO-G26011 REV IR.
Part: ATTACH ANGLE — CRACKED (ZONE 100) · airframe 27,357 hrs · 10,366 cycles
FWD CARGO COMPARTMENT INTERCOSTAL ATTACH ANGLE IS CRACKED AT BS 500H, S26R. REMOVED CRACKED ATTACH ANGLE AND BAFFLE AND REPLACED WITH NEW IAW SRM 51-40-02, 51-40-05, & DWG 143A7505 REV-.
Part: STRUCTURE — CORRODED (ZONE 200) · corrosion level 2 · airframe 27,357 hrs · 10,366 cycles
MAIN CABIN INNER CHORD AT R2 DOOR BS 947, RBL 55, WL 208 CORRODED. R & R INNER CHORD AT R2 DOOR IAW SRM 51-40-02, AND DWG 147A8501, REV A. NO FURTHER ACTION REQUIRED.
Part: FLOOR SUPPORT — CORRODED (ZONE 200) · corrosion level 2 · airframe 27,357 hrs · 10,366 cycles
MAIN CABIN FLOORBEAN AT LBL 51 - LBL 24, BS 947+4 FOUND TO BE CORRODED. R & R FLOORBEAM IAW SRM 51-40-02 AND DWG 147A5650, REV A. NO FURTHER ACTION REQUIRED. WORK ACCOMPLISHED AT AAR GSO ON NON-ROUTINE 9286383. R & R FLOORBEAM IAW SRM 51-40-02 AND DWG 147A5650, REV A. NO FURTHER ACTION REQUIRED.
Part: FLOOR SUPPORT — CORRODED (ZONE 200) · corrosion level 2 · airframe 27,357 hrs · 10,366 cycles
FLOOR SUPPORT BETWEEN BS 947 & 967, LBL 52.5 FOUND TO BE CORRODED. R & R FLOOR SUPPORT IAW SRM 51-40-02, & DWG 147A5650, REV A. NO FURTHER ACTION REQUIRED. WORK ACCOMPLISHED AT AAR GSO ON NON-ROUTINE 9286417.
Part: FLOOR SUPPORT — CORRODED (ZONE 200) · corrosion level 2 · airframe 27,357 hrs · 10,366 cycles
MAIN CABIN INTERCOSTAL AT BS 947, LBL 25, WL 208, UNDER HARD POINT FITTING HAS SIGNS OF CORROSION. R & R INTERCOSTAL IAW SRM 51-40-02 AND DWG 147A5650, REV A. NO FURTHER ACTION REQUIRED.
Part: INTERCOSTAL — CORRODED (ZONE 200) · corrosion level 2 · airframe 27,357 hrs · 10,366 cycles
MAIN CABIN INTERCOSTAL AT BS 947, RBL 50, WL 208 WAS CORRODED AT HARD POINT FITTING. REMOVED AND REPLACED INTERCOSTAL IAW SRM 51-40-02 & DWG 147A5650, REV-.
Part: FLOORBEAM — CORRODED (ZONE 200) · corrosion level 2 · airframe 27,357 hrs · 10,366 cycles
CORROSION ON THE TEE FITTING, BS 947, RBL 36, FWD OF R2 DOOR. REMOVED DAMAGE, HFEC OPEN HOLES & CUT AREA,NO DEFECTS NOTED. ROTO PEENED, FABRICATED & LOCATED REPAIR PARTS, INSTALLED AND RESTORED COATINGS IAW SRM 53-70-51-2R-5, AND DWG 147A5650. THIS IS A CAT 'A' REPAIR. NO FURTHER ACTION REQUIRED.
Part: FLOORBEAM — CORRODED (ZONE 200) · corrosion level 2 · airframe 27,357 hrs · 10,366 cycles
CORROSION ON THE TEE ANGLE AND FITTING AT BS 947, LBL 18. REMOVED DAMAGE, HFEC OPEN HOLES & CUT AREA, ROTO PEENED, NO DEFECTS NOTED. FABRICATED & LOCATED REPAIR PARTS, INSTALLED AND RESTORED COATINGS IAW SRM 53-70-51-2R-5 & DWG 147A5650, REV A. THIS IS A CAT 'A' REPAIR. NO FURTHER ACTION REQ.
Part: FLOOR SUPPORT — CORRODED (ZONE 200) · corrosion level 2 · airframe 27,357 hrs · 10,366 cycles
FLOOR SUPPORT BETWEEN BS 947 & BS 967, RBL 24.75, FOUND TO BE CORRODED. REMOVED AND REPLACED THE FLOOR SUPPORT IAW SRM 51-40-02, AND DWG 147A5650, REV A.
Part: CHANNEL — CORRODED (FWD CARGO) · corrosion level 2 · airframe 27,357 hrs · 10,366 cycles
RIGHT ZEE CHANNEL HAS MULTIPLE AREAS OF CORROSION. FWD CARGO. CORROSION TO SHIELD EXCESSIVE AND 100% MAT LOSS, OUT OF LIMITS IAW SRM 53-00-53. LOCATED, DRILLED AND INSTALLED NEW SHIELD IAW SRM 51-40-05, DWG 143A8126 REV-.
Part: TRANSITION PANEL — PUNCTURED (ZONE 100) · airframe 27,357 hrs · 10,366 cycles
AFT CARGO COMPARTMENT STA 767+3 LBL 23.5 L/H TRANSITION PANEL IS PUNCTURED. REPAIRED TRANSITION PANEL IAW SRM 53-00-53-2R-6.
Part: BATTERY PACK — FAULTED (ZONE 200) · airframe 27,058 hrs · 10,228 cycles
RT INTERIOR OVERWING EXIT EMERGENCY LIGHTS INOPERATIVE, ALONG WITH MIDDLE ISLE EXIT SIGN R&R STA 565 WL 213 RBL 68 EMERGENCY EXIT LIGHT BATTERY PACK IAW AMM 33-51-06-960-805.
Part: BATTERY PACK — INOPERATIVE (ZONE 200) · airframe 27,038 hrs · 10,220 cycles
EMERGENCY ESCAPE LIGHTS FROM ROW 7ABC TO 14ABC, RH OVERWING EXTERIOR LIGHT BETWEEN THE ESCAPE HATCHES AND OVERHEAD AISLE EMERGENCY EXIT SIGN BETWEEN OVERWING ESCAPE HATCHES ARE ALL INOP. THE OVERWING EMERGENCY LIGHT BETWEEN THE TWO ESCAPE HATCHES THAT IS INOP IS ON THE LH SIDE NOTHE THE RH R/R BATTERY PACK FOR EMERGENCY LIGHTING POWER SUPPLY IRW AMM TASK 33-51-06-960-805. OPS CHK NORMAL
Part: LAMP — INOPERATIVE (ZONE 800) · airframe 26,821 hrs · 10,127 cycles
L2 EMERGENCY SLIDE LIGHT OUT REPLACED WITH NEW LAMP AND OP' CHECK OK PER AMM TASK 33-51-04-960-801 UPDATED SDR
Earlier reports · 2022–2025 · 9 reports
2025
Part: PIN — UNSECURE (ELEC CONNECTOR) · airframe 25,478 hrs · 9,483 cycles
EMERGENCY LIGHTING SYSTEM OPERATIONAL CHECK. EMERGENCY LIGHT INOP AT 23C. FOUND PIN PUSHED BACK AT SIDEWALL DISC 23C. RESECURED PIN. OPS CHECK GOOD. REF. WDM 33-51-22-12.
Part: BULB — INOPERATIVE (ZONE 200) · airframe 25,156 hrs · 9,331 cycles
R/H AFT OVERWING EMERGENCY LIGHT INOP. SUPPORT TASK NSA EMX N/R 00266. REPLACED RH AFT OVER WING EMERGENCY LIGHT BULB AND TESTED GOOD IAW B737-800 AMM 33-51-04-960-801. DATA WAS TRANSCRIBED FROM NSA EMX N/R 00266.
Part: POWER SUPPLY — DISCHARGED (ZONE 200) · airframe 24,802 hrs · 9,159 cycles
EMERGENCY LIGHTING SYSTEM FUNCTIONAL CHECK (INTERIOR AND EXTERIOR) {MULT-33-3-0004} - M1673 FAILED FUNCTIONAL CHECK. REPLACED BATTERY PACK IN M1673 POWER SUPPLY TWICE, IAW AMM 33-51-06-960-805, UP TO AND INCLUDING STEP 4.E.(6)(B). TEST BUTTON ON POWER SUPPLY DOES NOT WORK. EMERGENCY LIGHTS FOR THIS POWER SUPPLY COME ON WHEN ATTENDANT PANEL SWITCH IS USED. NEED NEW CHARGER ASSY.PARTS USED: 99-3351-3-0015, QTY :2 REPLACED EMERGENCY LIGHT POWER SUPPLY M1673. 33-51-06-960-806. OP. CKS GOOD. PARTS USED: 53-3351-3-0013,QTY :1
Part: LIGHT — ABNORMAL (ZONE 200) · airframe 24,778 hrs · 9,147 cycles
EMERGENCY EXIT LIGHT 20DEF FLICKERS FOUND HALF OF THE WINDOW LED LIGHT NEAR SEATS 20DEF FLICKERING RESET POWER TO LIGHT NO HELP REQUESTING MEL 3302B DEACTIVATED ADD FAULT: 3321 RIGHT SIDE WINDOW LIGHTS BY PULLING AND SAFTYING BREAKER E11 ON P92 CB PANEL IN REFERENCE TO AMM 33-21-00 EMERGENCY LIGHTS WORK AS REQUIRED AT SEAT 20FED IN REFERENCE TO AMM 33-51-00 TOMC APPROVED DEACTIVATED RH WINDOW LIGHTS COMPLIED WITH MEL 3302B PLACARD INSTALLED ADD EMP:U410980 ADD FAULT: 3300 REMOVED AND REPLACED WINDOW LIGHT ON SEAT 20DEF OVERWING EMERGENCY EXIT DOOR IN REF AMM.TASK 33-21-00-960-805. OPS CHECK GOOD PARTS USED: 60-3321-3-0009, QTY :1
Part: SLIDE — NO DISCREPANCY (ZONE 800) · airframe 24,541 hrs · 9,039 cycles
1L SLIDE PACK BORDERLINE TOO HIGH INSPECTED 1L DOOR SLIDE PRESSURE PER AMM TASK 25-66-01-200-801. PRESSURE WITHIN LIMITS. OK FOR SERVICE.
Part: BATTERY PACK — DISCHARGED (ZONE 200) · airframe 24,242 hrs · 8,910 cycles
RIGHT GALLEY EMERGENCY LIGHTS INOP REMOVED AND REPLACED BATTERY PACK FOR FWD RIGHT GALLEY EMERGENCY LIGHTS. OPS CKS GOOD.PARTS USED: 99-3351-3-0015, QTY :1
2024
Part: PROXIMITY SENSOR — OUT OF TOLERANCE (LE FLAP) · airframe 20,506 hrs · 7,195 cycles
LE FLAP TRANSIT LIGHT ILLUMINATED AFTER SELECTINF FLAPS .PERFORM ED QRH PERFORMED FIM 27-88 TASK 805 STEP (4) UP TO STEP (4)(G). FOUND S168 RED TERMINAL AT D728A PIN K12 OUT OF TOLERANCE,250 OHMS TO GROUND. ADD EMP:U408540 REF WDM 27-81-11-2 FOR LEFT WING LEADING EDGE FLAP SENSOR S168 REMOVED AND REPLACED LE FLAP PROX SENSOR S168, IAW AMM 27-88-11, UP TO AND INCLUDING STEP 5.E.(2)(C). REQUIRES AVIONICS FOR WIRE SPLICE IAW FOLLOWING STEP. SPLICED IN LEFT WING LEADING EDGE FLAP SENSOR S168 REF SWPM 20-30-12 & WDM 27-81-11-2. PARTS USED: 29-2788-3-0007,QTY :1 REMOVED AND REPLACED LE FLAP PROX SENSOR S168, IAW AMM 27-88-11, OPS CHECKS GOOD.
2023
Part: BATTERY PACK — INOPERATIVE (M1675) · airframe 19,087 hrs · 6,641 cycles
EXIT LIGHT ABOVE L1 DOOR WILL NOT ILLUMINATE (REF. AAR NR 99978502). REPLACED BATTERY PACK M1675 WITH NEW BATTERY PACK IAW B737 AMM 33-51-06-960-805. INSTALLATION TEST GOOD. (WORK ACCOMPLISHED BY V937131 AND AAR QC A-83 V935067).
2022
Part: SLIDE — UNWANTED DEPLOY (L1 DOOR) · airframe 17,002 hrs · 5,826 cycles
SLIDE NOT DISARMED ON DO OR 1L ON OPENING. REPLACED DOOR 1 LEFT ESCAPE SLIDE REF AMM 25-66-01.