# SDR 2020FA0000525

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 7, 2020
- Submitted: December 8, 2020
- Operation: General aviation
- Aircraft: [N444JM](https://openairdocs.org/aircraft/N444JM), registered now
- Make and model: Cessna 340A
- Registry model: [Cessna 340A](https://openairdocs.org/model/cessna-340a) (OpenAirDocs)
- Aircraft serial: 340A0280
- System (JASC): [3411 · Pitot/Static System](https://openairdocs.org/jasc/3411)
- Part: Pitot Tube
- Part number: AN58121
- Condition: Cracked
- Location: Zone 100
- Stage of operation: IN
- How discovered: C
- Nature of condition: L
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/2020FA0000525

## Discrepancy

24 MONTH 91.411 & 91.413 TEST WAS DUE ON AIRCRAFT.  WE PERFORM A PITOT LEAK CHECK PRIOR TO PERFORMING THE STATIC SYSTEM TESTS TO ENSURE OUR TEST EQUIPMENT WILL FUNCTION PROPERLY.  WHEN SELECTING LEAK TEST MODE, I FOUND AN EXCESSIVE PITOT LEAK.  TROUBLESHOOTING ISOLATED THE LEAK TO THE FORWARD NOSE AREA OF THE AIRCRAFT.  WHEN I REMOVED THE PITOT TUBE, I FOUND THE RISER FROM THE PITOT TUBE TO BE CRACKED APPROXIMATELY 50% OF THE CIRCUMFERENCE OF THE TUBE.  WE REPLACED THE TUBE WITH A SERVICEABLE UNIT AND THE PITOT SYSTEM TESTED SATISFACTORILY, PER MY TEST EQUIPMENT WE HAD A 0 KNOT PER MINUTE LEAK RATE.  THE LOCATION OF THE PITOT TUBE AND PITOT LINE WERE LOCATED BELOW THE NOSE AVIONICS SHELF AND AHEAD OF AN AIR CONDITIONER CONDENSING COIL - THE CRACKED AREA WOULD NOT HAVE BEEN VISIBLE DURING A ROUTINE VISUAL INSPECTION.

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