What was found
HIGH PITCH NOISE FROM FWD COCKPIT AREA. GROUNDED - YES. ISOLATED TO FAULTY RADAR RT RACK COOLING FAN. REPLACED FAN ASSY. OP CK NORMAL. REF AMM 34-43-00-710-802-001 & 34-43-51-400-801.
- Difficulty date
- June 28, 2019
- Submitted
- July 1, 2019
- Operation
- Air carrier
- Aircraft
- N468AS
- Make and model
- Boeing 737990ER
- Aircraft serial
- 41735
- Aircraft time
- 19,768 hours, 6,479 cycles
- System (JASC)
- 2121 · Air Distribution Fan
- Part
- Cooling Fan
- Part number
- 6426512001
- Condition
- Noisy
- Location
- Weather Radar
- Stage of operation
- NR
- How discovered
- O
- Nature of condition
- O
- Precautionary procedure
- K
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.