SDR SWAA2021051070892

Service difficulty report · Drain · Boeing 7378H4

Difficulty date: May 6, 2021
Submitted: May 10, 2021
Operation: Air carrier
Aircraft: N8640D
Make and model: Boeing 7378H4
Aircraft serial: 60084
Aircraft time: 23,907 hours, 10,681 cycles
System (JASC): 2910 · Hydraulic System, Main
Part: Drain
Condition: Faulty
Location: Hyd System
Stage of operation: AP
How discovered: O
Nature of condition: K, J
Precautionary procedure: O

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

What was found

COMPLTE HYDRAULIC SYSTEM "B" FAILURE WHEN FLAPS EXTNEDED TO 5, EMDP & EDP LOW PRESSURE LIGHTS ILLUMINIATED & HYDRAULIC QTY WENT TO ZERO. / RAR O RINGS ON BY SYS. PRESSURE MODULE PRESSURE SWITCH IAW AMM 29-11-91. RAR B SYS. EMDP CASE DRAIN FILTER IAW AMM 29-11-41 AND B SYS. EDP CASE DRAIN IAW AMM 29-11-51, FILTERS FOUND CLEAN & FREE OF DEBRIS. PERFORMED HYDRAULIC SYS. BLEED IAW AMM 29-00-00. OPS CHECKS AND LEAK CHECKS GOOD, NO FURTHER DEFECTS NOTED.

More about the Boeing 737-8H4