Service difficulty report · Switch · Boeing 737990ER

Difficulty date
June 30, 2023
Submitted
July 3, 2023
Operation
Air carrier
Aircraft
N491AS
Make and model
Boeing 737990ER
Aircraft serial
44109
Aircraft time
28,299 hours, 8,860 cycles
Part
Switch
Part number
21C1321
Condition
Inoperative
Location
Right Main Tank
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

CAPT REPORTED RIGHT AFT PUMP LOW PRESSURE LIGHT WAS INOP. GROUNDED - YES. TROUBLESHOT TO VERIFY LIGHT; LOW PRESSURE WAS INOP. REMOVED AND REPLACED FUEL BOOST PUMP PRESSURE SWITCH. OPS CHECK GOOD, REF B737-900 AMM 28-42-11.