Service difficulty report · Relief Valve · Boeing 7472D7B

Difficulty date
May 24, 2006
Submitted
June 7, 2006
Operation
Air carrier
Aircraft
N528MC
Make and model
Boeing 7472D7B
Aircraft serial
22472
Aircraft time
76,886 hours, 15,282 cycles
Engine
Ge CF650E2
Engine time
75,420 hours, 15,281 cycles
Part
Relief Valve
Part number
3206257
Part serial
404
Condition
Leaking
Location
Nr 1 Enigne
Stage of operation
CL
How discovered
O
Nature of condition
A, J
Precautionary procedure
E, A

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

What was found

AT 3000 FT DURING CLIMBOUT FIRE DETECTION LIGHT ON PILOT'S CENTER ANNUNCIATOR PANEL ILLUMINATED, FOLLOWED SHORTLY BY A FIRE INDICATION ON NR 1 ENGINE. FIRE CAUSED SEVERE DAMAGE OR SEPARATION, CHECKLIST COMPLETE AS PER FHB 3.701. OVERWEIGHT LANDING AT 287.0 KG. FOUND NR 1 ENG PRESS RELIEF VLV AND PRESS REGULATING VLV, FOUND TO BE RELIEVING VIOLENTLY. (REFER PAD 250 LP 581351 ITEM 1 I.E. DAMAGED TO LT C-DUCT) AND LEAKING AT BODY. LP 101050 ITEM 1. ALL REPLACED. H1 POWER RUN C/OUT NAC. TEMP OK.

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