Service difficulty report · Isolation Valve · Boeing 767316

Difficulty date
July 13, 2019
Submitted
July 16, 2019
Operation
Air carrier
Aircraft
N1381A
Make and model
Boeing 767316
Aircraft serial
27615
Aircraft time
86,557 hours, 18,557 cycles
Part
Isolation Valve
Part number
2780539102
Part serial
0394
Condition
Malfunctioned
Location
Bleed Air Sys
Stage of operation
DE
How discovered
O
Nature of condition
J
Precautionary procedure
O

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

What was found

DESCENDING THRU FL 250-FL240, L ENGINE N1 & N2 SURGED APPROX 7-8%. ALSO, SEI FLASHED ON MOMENTARILY.(<P>FOR CORRECTIVE ACTION SEE ITEM M4, M5, M6, M7, M8, ACTION PLAN AP15533, & ECM 2019P-291.<BR /></P><P>LP 1033691 - M4: R/R LT PRSOV IAW AMM 36-11-09/401. OPERATIONAL TEST REQUIRED (ENGINE RUN). RAN LT ENG IAW AMM 71-00-00. TESTS GOOD.</P><P>LP 1033691 - M5: R/R DISCRETES PRINTED CIRCUIT CARD IAW IAW AMM 73-21-11/401 (M644). OPERATIONAL TEST REQUIRED. <SPAN>RAN LT ENG IAW AMM 71-00-00. TESTS GOOD.</SPAN></P><P>LP 1033691 - M6: R/R THE FOLLOWING RELAYS: K167, K141, K434, K1034, K1025 AND K785 IAW SSM 73-21-02. OPERATIONAL TEST REQUIRED. ENG RUN NORMAL IAW AMM 71-00-00.</P><P>LP 1033692 - M7: ACCOMPLISHED WIRING CHECKS PER WDM 73-21-11 AND 73-21-19. MEGGER AND CONTINUITY CHECKS OK. R/R M838 FLAP STAB POSITION MODULE PER AMM 27-58-01. OPS CHECK OK.</P><P>LP 1033692 - M8: R/R LT ISOLATION VALVE IAW AMM 36-11-04. LEAK CHECK AND TEST OK</P>)