# SDR 20000413SH046

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 13, 2000
- Submitted: April 13, 2000
- Operation: General aviation
- Aircraft: [N560MM](https://openairdocs.org/aircraft/N560MM), registered now
- Make and model: Cessna 560CESSNA
- Aircraft serial: 5600235
- System (JASC): [3241 · Brake Anti-Skid Section](https://openairdocs.org/jasc/3241)
- Part: Control Box
- Part number: 99123056
- Part serial: 847
- Condition: Failed
- Location: Anti-Skid System
- Part time: 2,545 hours
- Component: HYTROL7K3427
- Stage of operation: TX
- How discovered: O
- Nature of condition: O
- Precautionary procedure: D
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/20000413SH046

## Discrepancy

DURING TAH, PRIOR TO TAKEOFF, FOOT BRAKES APPLIED, NO BRAKING ACTION TOOK PLACE.  BRAKE SYS PRE-SELECTED TO THE ATTACHED MODE.  INVEST REVEALED WITH ANTI-SKID SELECTED THE FAULT LIGHT WAS OUT WITH BRAKES APPLIED.  INITIALLY, BRAKES WENT ON, BUT RELEASED AND STAYED RELEASED.  APPEARS ANTI-SKID CONTROL BOX FAILED WITH BRAKE VALVES IN OPEN POSITION.  BRAKE ANTI-SKID CONTROL BOX, PN 9912305-6, SN 847, WAS REMOVED.  RECORDS SHOWS ORIG INSTALL 12-93, ACFT BUILD DATE.  A TEST OF INDICATION SYS FOR ANTI-SKID SHOWED SWITCH ON-LIGHT OUT, BUT ON REPLACEMENT PART, SWITCH ON-LIGHT OUT-LIGHT ON-LIGHT OUT.  (X)

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