# SDR CALA2026100820212

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 6, 2026
- Submitted: October 8, 2026
- Operation: Air carrier
- Aircraft: [N57864](https://openairdocs.org/aircraft/N57864), registered now
- Make and model: Boeing 757-33N
- Registry model: [Boeing 757-33N](https://openairdocs.org/model/boeing-757-33n) (OpenAirDocs)
- Aircraft serial: 32588
- Aircraft time: 75,063 hours, 23,113 cycles
- Engine: Rroyce RB211535E4
- System (JASC): [3241 · Brake Anti-Skid Section](https://openairdocs.org/jasc/3241)
- Part: Autobrake Sys
- Part number: 427571
- Part serial: 00695
- Condition: Faulted
- Location: E/E Bay
- Part time: 104,521 hours, 25,089 cycles
- Stage of operation: AP
- 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/CALA2026100820212

## Discrepancy

NORM ANTISKID EICAS S ANTI SKID SYSTEM FAILURE IN THE NORMAL SYSTEM. PILOTS STATED: TRIED RESET TWO TIMES. MESSAGES CAME BACK BOTH TIMES. AFTER 3RD, RESET MESSAGES DID NOT CLEAR. BIT THE ANTI SKID BOX, LAST FAULT IS BOX 2-6.  ALSO HAVE FAULT BOX A/B .   REMOVED COMPUTER AND TEMP INSTALLED NEW ANTI SKID COMPUTER. PERFORMED OPS TEST IN AMM 32-42-01-404-021. AFTER STEP 4 (B) 4) GOT FAULT CODE "BOX 3-7". ANTI SKID SWITCH DID NOT DISARM UNTIL 45 SECONDS.  REINSTALLED ORIGINAL AUTO BRK/ANTI SKID COMPUTER. PERFORMED SAME TEST, GOT FAULT "BOX 3-7" AGAIN. REQUIRES MORE TROUBLE SHOOTING. REF FIM 32-42 FAULT TREE 802.   ORIGINAL FAULTS WERE BOX A/B AND BOX 2-6.  ACFT IN ORIGINAL CONFIGURATION. NO ANTI SKID OR AUTO BRAKE EICAS MESSAGES DISPLAYED AT ARRIVAL TO ACFT. ALIGNED , POWERED HYDS, RELEASED BRAKES CLEARED AACU FAULTS. ACP AACU BITE. BITE SHOWS BOX-3-7 AND PWR A-B FAULTS. EICAS SHOWS NO MESSAGES IN COCKPIT. AACU (WHICH WOULD INCLUDE 3-7 WHEEL CARD) HAS BEEN CHANGED. SUSPECT INTERMITTANT TRANSDUCER 3 OR M&E.

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