What was found
HYDRAULIC SYSTEM #4 RESERVOIR QUANTITY INDICATION GRADUALLY DECREASED IN FLIGHT.(<P>RETURNED TO DEPARTURE AIRPORT. REMOVED AND REPLACED # 4 HYD QTY TRANSMITTER PER AMM 29-33-01. NO LEAKS NOTED. HYD QTY SHOW NORMAL 1.05.</P>)
- Difficulty date
- January 27, 2022
- Submitted
- January 31, 2022
- Operation
- Air carrier
- Aircraft
- N471MC
- Make and model
- Boeing 747412
- Aircraft serial
- 26557
- Aircraft time
- 85,135 hours, 13,784 cycles
- System (JASC)
- 2930 · Hydraulic Indicating System
- Part
- Transmitter
- Part number
- FP0207A
- Part serial
- 1046BA
- Condition
- None
- Stage of operation
- CL
- How discovered
- V
- Nature of condition
- N
- Precautionary procedure
- A
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.