February 2002 WTT face to face CFMI / Boeing Proprietary Information - Unauthorized Disclosure, Use, or Export are Prohibited 1 Booster Spool Forward Flange Wear February 2002 WTT face to face CFMI / Boeing Proprietary Information - Unauthorized Disclosure, Use, or Export are Prohibited 2 Background • During shop visit, premature glazing/wear marks observed on the forward flange of the booster spool at each fan B=blade position Glazing/wear marks caused by contact with fan blade shank aft surface during wind milling and engine start sequence Booster Spool Forward Flange Wear FWD Flange mating surface February 2002 WTT face to face CFMI / Boeing Proprietary Information - Unauthorized Disclosure, Use, or Export are Prohibited 3 Field Exposure - Sampling Program B20 1 B20/2 15 B22 1 B24 2 B26/2 4 B20 0,000 B20/2 0,053 B22 0,081 B24 0,086 B26/2 0,018 23 0,049 Engine Qty Wear per 10,000 EFC (millimeters) Total Engine Qty Total Wear per 10,000 EFC (millimeters) Booster Spool Forward Flange Wear February 2002 WTT face to face CFMI / Boeing Proprietary Information - Unauthorized Disclosure, Use, or Export are Prohibited 4 Field Exposure - Sampling Program 0 0,05 0,1 0,15 0,2 0,25 0,3 0 5000 10000 15000 20000 25000 30000 OPERATING TIME (Cycles Since New) WEAR DEPTH (mm) Fleet average Projected wear at part life limit expiration: 0,005 in. (0,12 mm) 9365 Booster Spool Forward Flange Wear February 2002 WTT face to face CFMI / Boeing Proprietary Information - Unauthorized Disclosure, Use, or Export are Prohibited 5 Windmilling test • Objectives Reproduce wear seen in the field with current design Define the best improvement : – Seven new coatings tested: Baseline Two types of Teflon coating Cu-Ni-In Cu-Al Double Molydag varnish Baseline with periodic relube Molydag on # surface roughness – Low speed (33 rpm) giving full rocking of the fan blades ESN 874986 - 2.8 mils wear depth Booster Spool Forward Flange Wear February 2002 WTT face to face CFMI / Boeing Proprietary Information - Unauthorized Disclosure, Use, or Export are Prohibited 6 Booster Spool Forward Flange Wear February 2002 WTT face to face CFMI / Boeing Proprietary Information - Unauthorized Disclosure, Use, or Export are Prohibited 7 Windmilling Test • Preliminary results (1 cycle = 1 rev) : 1,686,000 cycles cumulated on 7 Jan 02 – Wear initiated with current design : 0.4 mils 2,231,000 cycles cumulated on Jan 21, 02 – Wear increased with current design : 1.2 mils Wear with new configurations not measured yet • Plan Continue current test Wear phenomenon is not linear Wear threshold with current definition now achieved, therefore final results expected by end of Feb 2002 Booster Spool Forward Flange Wear February 2002 WTT face to face CFMI / Boeing Proprietary Information - Unauthorized Disclosure, Use, or Export are Prohibited 8 Interim Control Program • CESM No. 005 being revised to recommend lubrication in this area Benefit confirmed through engine test – Booster spool condition not directly affected by the introduction of elastomer axial buttons on Fan Retaining Flange (SB 72-318 or 72-325) • Booster Spool front flange wear serviceability being extended Part installed : serviceable if not more than 0.008 in. (0,20 mm) deep Part removed : serviceable if not more than 0.003 in. (0,08 mm) deep • Repair procedure being developed to restore part condition at piece-part-level • New analysis in process to increase the 0,2 mm limit • Continue to gather data in the fleet to better appreciate the wear propagation rate Booster Spool Forward Flange Wear February 2002 WTT face to face CFMI / Boeing Proprietary Information - Unauthorized Disclosure, Use, or Export are Prohibited 9 Long Term Action • Design improvement being reviewed to prevent occurrence of unserviceable condition Application of thermal sprayed coating (Al-Cu or Cu-Ni-In) on fan blade shank AFT surface decision based on Windmilling test results Booster Spool Forward Flange Wear作者: kinran 时间: 2011-6-4 23:28:00
