# SDR IPXA2026080511366

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 11, 2026
- Submitted: August 5, 2026
- Operation: Air carrier
- Aircraft: [N150UP](https://openairdocs.org/aircraft/N150UP), registered now
- Make and model: Airbus A300 F4-622R
- Registry model: [Airbus A300 F4-622R](https://openairdocs.org/model/airbus-a300-f4-622r) (OpenAirDocs)
- Aircraft serial: 0833
- Aircraft time: 28,137 hours, 16,941 cycles
- System (JASC): [3240 · Landing Gear Brake System](https://openairdocs.org/jasc/3240)
- Part: Brake
- Part number: C20101610003
- Part serial: UP57978
- Condition: Indication
- Location: Zone 700
- Stage of operation: DE
- How discovered: O
- Nature of condition: J
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/IPXA2026080511366

## Discrepancy

EMERGENCY DECLARED,  UPON LOWERING THE GEAR FOR LANDING, BRAKE RELEASE SIGNAL FOR WHEELS 5 & 8 WAS MISSING. CYCLED THE ANTI-SKID SWITCH & ELECTED TO FOLLOW ANTI-SKID FAULT CHKLIST. RELEASE SIGNAL FOR WHEEL 6 ALSO DISAPP, CHECKED RESISTANCE FOR BRAKE SERVO VALVES IAW ASM 32-42-00 SCH 06, NR 5 NORMAL BRAKE SERVO VALVE (19GG) 104 OHMS, NR 8 NORMAL BRAKE SERVO VALVE (20GG) 106 OHMS,  NR 5 & NR 6 ALTERNATE BRAKE SERVO VALVE (77GG) 104 OHMS, NR 7 & 8 ALTERNATE BRAKE SERVO VALVE (78GG) 102 OHMS REF TSM 32-42-00/101 FIG 101. PERFORMED BITE CHK ON BSCU, NO FAULTS RECORDED. R & R BSCU (29GG) IAW AMM 32-42-72/401, OPS CHKD NORMAL IAW AMM 32-42-00/501.

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