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Open navigation menu Close suggestionsSearchSearch enChange Language UploadDownload free for 30 days User Settings close menu Welcome to Scribd! * Upload * Read for free * FAQ and support * Language (EN) * Sign in 0 ratings0% found this document useful (0 votes) 217 views ASA AFT SUMP LEAK - CUSTOMER EXP - 2017 WTT UPLOADED BY ali AI-enhanced The document discusses oil leaks from the turbine rear frame scavenge oil tube interface on CFM56-7B engines. It provides background on 59 engines in service and 23 leak events found through… Full description Download SaveSave 23. ASA Aft Sump Leak - Customer Exp - 2017 WTT For Later 0%0% found this document useful, undefined 0%, undefined Embed Share Print Report ASA AFT SUMP LEAK - CUSTOMER EXP - 2017 WTT UPLOADED BY ali 0 ratings0% found this document useful (0 votes) 217 views 9 pages AI-enhanced title and description DOCUMENT INFORMATION click to expand document information The document discusses oil leaks from the turbine rear frame scavenge oil tube interface on CFM56-7B engines. It provides background on 59 engines in service and 23 leak events found through inspections. The leaks were investigated and found to be caused by loss of bolt torque on the oil inlet cover, compressing the gasket. A fleet campaign and service bulletin introduced a new gasket design and torqueing procedure to address the issue. ORIGINAL DESCRIPTION: ENGINE ORIGINAL TITLE 23. ASA Aft Sump Leak - Customer Exp - 2017 WTT COPYRIGHT © © All Rights Reserved AVAILABLE FORMATS PDF, TXT or read online from Scribd SHARE THIS DOCUMENT SHARE OR EMBED DOCUMENT SHARING OPTIONS * Share on Facebook, opens a new window Facebook * Share on Twitter, opens a new window Twitter * Share on LinkedIn, opens a new window LinkedIn * Share with Email, opens mail client Email * Copy link Copy link DID YOU FIND THIS DOCUMENT USEFUL? 0%0% found this document useful, Mark this document as useful 0%0% found this document not useful, Mark this document as not useful IS THIS CONTENT INAPPROPRIATE? Report Download now Download as pdf or txt SaveSave 23. ASA Aft Sump Leak - Customer Exp - 2017 WTT For Later 0 ratings0% found this document useful (0 votes) 217 views9 pages ASA AFT SUMP LEAK - CUSTOMER EXP - 2017 WTT UPLOADED BY ali AI-enhanced title and description The document discusses oil leaks from the turbine rear frame scavenge oil tube interface on CFM56-7B engines. It provides background on 59 engines in service and 23 leak events found through… Full description SaveSave 23. ASA Aft Sump Leak - Customer Exp - 2017 WTT For Later 0%0% found this document useful, undefined 0%, undefined Embed Share Print Report Ask AI Download now Download as pdf or txt Jump to Page You are on page 1of 9 Search inside document 737NG Aft Sump Oil Leaks ASA Customer Experience Lorne Dyke, ASA Powerplant Engineering June 27, 2017 adDownload to read ad-free 2 © 2016 Alaska Airlines -Confidential -7BE Turbine Rear Frame Oil Leaks Background: • CFM56-7B27E post PIP configuration • ASA currently have 59 in service, 1 st delivery Jan 2012 on -800 • Short Exhaust Nozzle & Plug, starting LN 3700, Boeing PRR38918 • -7BE LPT efficiency improvement, changed pressure ratio • Altered differential pressure across Oil Inlet Cover (OIC) Unlock this document Upload a document to download this document or subscribe to read and download. Continue for free or Unlock this page after an ad 6 adDownload to read ad-free 3 © 2016 Alaska Airlines -Confidential -7BE Turbine Rear Frame Oil Leaks Background: • 23 leak events in 114 inspections •Discovery TSN ranging from 323 to 7439 FH’s, Avg 2955 FH’s • Minimally invasive inspection, approx. 2 hrs • T/R opening, visual inspection of TRFstrut at external scavenge tube Unlock this document Upload a document to download this document or subscribe to read and download. Continue for free or Unlock this page after an ad 10 adDownload to read ad-free 4 © 2016 Alaska Airlines -Confidential -7BE Turbine Rear Frame Oil Leaks • CFM confirmed aft sump leak path during motoring and low speed • No detectable increase in oil consumption trends • ASA coordinated with Boeing AR and Fire Marshall to gain leak deferral • Repair within 16 FC, 4 calendar days Unlock this document Upload a document to download this document or subscribe to read and download. Continue for free or Unlock this page after an ad 10 adDownload to read ad-free 5 © 2016 Alaska Airlines -Confidential -7BE Turbine Rear Frame Oil Leaks Investigation & Fleet Campaign : • OICbolt torque loss, discovered at airlines, verified after engine ATP • Gasket compression set, then clamping load loss • Bolt breakaway 10-40 lb-in, versus assembly 110-120 lb-in torque • OIC gasket “extrusion” either side of 6 o’clock, at No. 5 Bearing Support scavenge oil fitting • Warranted gasket design change, use of metallic mesh & graphite sheet: SB 72-0998 • Multi-step torqueing procedures for gasket compression set required • ASA Fleet Campaign: • ASA Engineering order to inspect, provide deferrable condition (if TRFNo. 7 strut drain not plugged), within 1000 hrsTSN • Auto attach deferred repair Engineering order • On-wing repair with OICR&R, approx. 6 hrs • No repeat offenders yet discovered Unlock this document Upload a document to download this document or subscribe to read and download. Continue for free or Unlock this page after an ad 10 adDownload to read ad-free adDownload to read ad-free adDownload to read ad-free adDownload to read ad-free REWARD YOUR CURIOSITY Everything you want to read. Anytime. Anywhere. Any device. Read free for 30 days No Commitment. Cancel anytime. 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