# SDR SWAA2021022249031

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 16, 2021
- Submitted: February 22, 2021
- Operation: Air carrier
- Aircraft: [N8310C](https://openairdocs.org/aircraft/N8310C), registered now
- Make and model: Boeing 737-8H4
- Registry model: [Boeing 737-8H4](https://openairdocs.org/model/boeing-737-8h4) (OpenAirDocs)
- Aircraft serial: 38807
- Aircraft time: 29,418 hours, 13,178 cycles
- System (JASC): [3411 · Pitot/Static System](https://openairdocs.org/jasc/3411)
- Part: Pitot Tube
- Part number: 0851HT1
- Part serial: 332466
- Condition: Unreliable
- Location: Left
- Stage of operation: IN
- How discovered: 9
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/SWAA2021022249031

## Discrepancy

AIRSPEED UNRELIABLE MESSAGE DURING TAKE OFF AT APPROX 90KTS. CA & FO AIRSPEED DIFFERED BY 10KTS. AIRSPEED BETWEEN CA; STBY; & FO; INDICATIONS VARIED BY 5 TO 10 KTS; THEN RETURNED TO NORMAL. UNABLE TO DETERMINE WHICH INDICATOR WAS INNACURATE. / T/S PER FIM 31-62-TASK 826 FOUND LEFT PITOT TUBE CLOGGED. REMOVED + REPLACED LEFT PITOT TUBE ASSY PER AMM 34-11-01 LEAK CHK NORMAL. ISSUE# 3207739 E004777POS LH TAG 1044067 PN OFF 0851HT-1 SN OFF 332466 PN ON 232A9105-20RA PN ON 232A9105-20RA SN ON 363388

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