# SDR VNAA202201131111

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 9, 2022
- Submitted: January 13, 2022
- Operation: Air carrier
- Aircraft: [N587NN](https://openairdocs.org/aircraft/N587NN), registered now
- Make and model: Cndair CL6002D24
- Aircraft serial: 15390
- Aircraft time: 12,855 hours, 11,713 cycles
- System (JASC): [3241 · Brake Anti-Skid Section](https://openairdocs.org/jasc/3241)
- Part: Control Unit
- Part number: 900044331
- Part serial: AUG150413
- Condition: Unserviceable
- Location: Zone 700
- Part time: 12,861 hours, 1,717 cycles
- Stage of operation: DE
- How discovered: V
- Nature of condition: J
- Precautionary procedure: L
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/VNAA202201131111

## Discrepancy

ANTISKID OUTBOARD BECAME INOPERATIVE ON DESCENT INTO MSN. THE FLIGHT DIVERTED TO ORD. THEY DECLARED AN EMERGENCY, DID NOT BRACE, AND DID NOT LAND OVERWEIGHT. ANTI/SKID OUTBOARD CAUTION MSG IN FLIGHT  / DEFERRED ANTI-SKID SYSTEM OUTBOARD CHANNEL PER MEL 32-44-01-2 CAT B. C/W M FUNCTION BY PERFORMING OPS CHECK OF BRAKE SYSTEM IAW CRJ 900 AMM 32-43-00-710-801.  INTERROGATED MDC AND FOUND NO CURRENT FAULTS, MDC HISTORY HAD B1 CODES 006057, 006058, & 007479.  REMOVED  & VISUALLY INSPECTED R/H O/B MLG WHEEL SPEED TRANSDUCER AND ASSOCIATED WIRING AND REINSTALLED IAW CRJ 900 AMM 32-44-01-000/400-801. PERFORMED CONTINUITY CHECK OF ASCU A165P1 PIN 51 TO 50 NO OPEN CIRCUIT. REMOVED AND REPLACED ASCU IAW CRJ 900 AMM 32-44-06-000/400-801 OP CHECK AND BITE CHECK GOOD THIS CLEARS MEL

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