SDR ASAA2022072039153

Service difficulty report · Drive Unit · Boeing 7379

Difficulty date: July 20, 2022
Submitted: July 22, 2022
Operation: Air carrier
Aircraft: N915AK
Make and model: Boeing 7379
Aircraft serial: 44080
Aircraft time: 3,899 hours, 1,247 cycles
System (JASC): 3440 · Independent Position Determining System
Part: Drive Unit
Part number: 8222130001
Part serial: 4KL492
Condition: Faulty
Location: Nose Radome
Part time: 3,915 hours, 1,255 cycles
Stage of operation: NR
How discovered: V
Nature of condition: O
Precautionary procedure: K

As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.

What was found

WX RADAR IS WORKING INTERMITTENTLY. RED STREAK FROM A/C TO 10-11 O'CLOCK POSITION ON DISPLAY. GROUNDED - YES. PERFORMED WXR OPS TEST NORMAL, UNABLE DUPLICATE DISCREPANCY ON GROUND, FOR PRECAUTIONARY, REPLACED NEW ANTENNA DRIVE UNIT, PERFORMED INSTALLATION TEST GOOD B737-9 AMM 34-41-11/401.

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