BHT-412-MM-1 MAINTENANCE MANUAL VOLUME 1 GENERAL INFORMATION NOTICE The instructions set forth in this manual, as supplemented or modified by Alert Service Bulletins (ASB) or other directions issued by Bell Textron Inc. and Airworthiness Directives (AD) issued by the applicable regulatory agencies, shall be strictly followed. COPYRIGHT NOTICE COPYRIGHT 2021 BELL TEXTRON INC. AND BELL TEXTRON CANADA LIMITED. ALL RIGHTS RESERVED 32672)),&(%2;)257:257+7(;$6 REISSUE — 23 JUNE 1994 Export Classification C, ECCN EAR99 REVISION 30 — 21 JANUARY 2021 BHT-412-MM-1 PROPRIETARY RIGHTS NOTICE These data are proprietary to Bell Textron Inc. Disclosure, reproduction, or use of these data for any purpose other than helicopter operation or maintenance is forbidden without prior written authorization from Bell Textron Inc. DESTINATION CONTROL STATEMENT WARNING — This document contains technical data whose export is restricted by the Arms Export Control Act (Title 22, U.S.C., Sec 2751, et. seq.) or the Export Administration Act of 1979, as amended, Title 50, U.S.C., App. 2401 et. seq. Violations of these export laws are subject to severe criminal penalties. Disseminate in accordance with provisions of DoD Directive 5230.25. PN Rev. 28 13 DEC 2019 Export Classification C, ECCN EAR99 BHT-412-MM-1 WARNING 7+,6 0$18$/ $33/,(6 21/< 72 +(/,&237(56 $1' &20321(176 0$,17$,1(' ,1 $&&25'$1&( :,7+ %(// 7(;7521 ,1& $33529('352&('85(686,1*%(//$33529('3$576 $// ,163(&7,21 5(3$,5 $1' 29(5+$8/ 352&('85(6 38%/,6+(' %<%(//,1&/8',1*3$575(7,5(0(17/,)($5(%$6('62/(/<21 7+(86(2)%(//3$5767+$7+$9(%((10$,17$,1('86,1*%(// $33529(''$7$7+('$7$38%/,6+('+(5(,12527+(5:,6( 6833/,('%<%(//,6127$33/,&$%/(72121%(//3$57625 3$5767+$7+$9(%((15(3$,5('86,1*'$7$$1'25352&(66(6 127$33529('%<%(// %(//,61275(63216,%/()25$1<3$5727+(57+$17+26(7+$7 ,7+$6$33529(' %()25( 3(5)250,1* $1< 352&('85( &217$,1(' ,1 7+,6 0$18$/ <28 0867 ,163(&7 7+( $))(&7(' 3$576 $1' 5(&25'6 )25 (9,'(1&( 2) $1< 0$18)$&785( 5(3$,5 5(:25. 25 86( 2) $ 352&(66127$33529('%<%(// ,) <28 ,'(17,)< 25 6863(&7 7+( 86( 2) 3$576 127 $87+25,=(' %<%(//(,7+(55(029(7+($))(&7(',7(0)5207+($,5&5$)7 252%7$,1,16758&7,216)25&217,18('$,5:257+,1(66)520 7+(0$18)$&785(5257+(25*$1,=$7,217+$7$33529('7+( 5(3$,5 Export Classification C, ECCN EAR99 13 DEC 2019 Rev. 28 Warning BHT-412-MM-1 CUSTOMER SUPPORT AND SERVICES Flying smart means that no matter where you are, or what time it is, you can make a call and get additional information, clarification, or advice on a technical or operational issue concerning your helicopter or information contained in our Technical Publications. Product Support Engineering (PSE) is just a phone call away and may be contacted as follows: Model 206, 407, or 505 Phone: 450-437-2862 or 800-363-8023 (U.S./Canada) Fax: 450-433-0272 E-mail: [email protected] Model 222, 230, 427, 429, or 430 Phone: 450-437-2077 or 800-463-3036 (U.S./Canada) Fax: 450-433-0272 E-mail: [email protected] Model 204, 205, 212, or 412 Phone: 450-437-6201 or 800-363-8028 (U.S./Canada) Fax: 450-433-0272 E-mail: [email protected] Model 210, HUEY II and All Bell’s Active and Surplus Military Medium Helicopter Models Phone: 817-280-3548 Fax: 817-280-2635 E-mail: [email protected] Model OH-58, TH-67, TH-57, Both Active and Surplus Military Phone: 817-280-3548 Fax: 817-280-2635 E-mail: [email protected] For additional information on Customer Support and Services as well as Product Support Engineering (PSE) and your local Customer Service Engineering (CSE) network, please access https://www.bellflight.com/support. CSS Rev. 30 21 JAN 2021 Export Classification C, ECCN EAR99 BHT-412-MM-1 LOG OF REVISIONS Insert latest revision pages and dispose of superseded ones. On a revised page, the text and/or illustration affected by the latest revision is shown by a vertical line. A revised page with only a vertical line next to the page number indicates that text has shifted or that non-technical correction(s) were made on that page. Original ........ 0 ............ 15 JAN 81 Reissue ....... 0........... 29 MAR 90 Revision .......13 ......... 29 OCT 09 Revision....... 1 ............15 MAY 81 Revision ...... 1............ 20 FEB 91 Revision .......14 ..........14 JUN 10 Revision....... 2 ........... 15 NOV 81 Revision ...... 2............06 DEC 91 Revision .......15 ......... 01 MAY 12 Revision....... 3 ............ 24 FEB 82 Revision ...... 3............ 28 FEB 92 Revision .......16 ..........26 FEB 13 Revision....... 4 ........... 09 NOV 82 Reissue ....... 0............ 07 JUN 93 Revision .......17 .........26 MAR 13 Revision....... 5 ........... 09 DEC 82 Revision ...... 1............08 DEC 93 Revision .......18 ..........30 JUN 13 Revision....... 6 ............ 15 JAN 83 Reissue ....... 0............ 23 JUN 94 Revision .......19 ......... 30 AUG 13 Revision....... 7 ........... 31 MAR 83 Revision ...... 1............ 12 APR 95 Revision .......20 ..........02 SEP 14 Revision....... 8 ............01 MAY 83 Revision ...... 2............. 10 JUL 95 Revision .......21 ..........30 JAN 15 Revision....... 9 ............ 29 JUN 83 Revision ...... 3............ 15 APR 96 Revision .......22 ........... 24 JUL15 Revision....... 10 ......... 20 OCT 83 Revision ...... 4............04 OCT 96 Revision .......23 ......... 15 DEC 15 Revision....... 11 .......... 10 JAN 84 Revision ...... 5............ 16 FEB 01 Revision .......24 ..........15 SEP 16 Revision....... 12 ......... 16 MAR 84 Revision ...... 6............01 OCT 02 Revision .......25 .........07 NOV 16 Revision....... 13 ..........15 APR 84 Revision ...... 7............ 30 SEP 03 Revision .......26 ..........01 JUN 18 Revision....... 14 ...........30 JUL 84 Revision ...... 8............ 18 JUN 04 Revision .......27 ..........25 SEP 18 Revision....... 15 ..........10 SEP 84 Revision ...... 9............13 AUG 04 Revision .......28 ......... 13 DEC 19 Revision....... 16 ......... 19 NOV 84 Revision ...... 10.......... 30 JUN 05 Revision .......29 ..........28 FEB 20 Revision....... 17 ..........15 APR 86 Revision ...... 11......... 30 MAR 07 Revision .......30 ..........21 JAN 21 Revision....... 18 .......... 03 JUN 87 Revision ...... 12.......... 27 FEB 09 LOG OF PAGES Page No. Rev No. Page No. Rev No. Page No. Rev No. VOLUME 1 VOLUME 2 11/12 ........................................28 Cover .......................................28 Cover....................................... 28 13 – 22 .....................................28 Title ..........................................30 Title.......................................... 30 23 – 24 .....................................29 PN ............................................28 PN............................................ 28 25 – 28 .....................................28 Warning....................................28 29 – 30 .....................................29 CSS..........................................30 Chapter 4 31 – 33 .....................................28 A – J .........................................30 1 – 3......................................... 24 34 – 35 .....................................29 Help..........................................28 4............................................... 30 36 .............................................30 Customer Feedback.................30 5 – 6......................................... 27 37 .............................................28 Helicopter Sales Notice............30 7............................................... 30 38 .............................................29 Warranty...................................28 8 – 14....................................... 27 39 – 49 .....................................28 BR ............................................28 15............................................. 30 50 .............................................29 TR ............................................16 16............................................. 24 51 – 52 .....................................28 i/ii..............................................16 53/54 ........................................28 Chapter 5 55 - 61......................................28 Chapter 1 1 – 2......................................... 30 62 .............................................29 1/2 ............................................22 3/4............................................ 30 63 .............................................28 3 ...............................................23 5 – 7......................................... 28 64 – 65 .....................................29 4 – 8.........................................22 8............................................... 30 66 – 75 .....................................28 9 – 10....................................... 28 76 .............................................30 Export Classification C, ECCN EAR99 21 JAN 2021 Rev. 30 A BHT-412-MM-1 LOG OF PAGES (CONT) Page No. Rev No. Page No. Rev No. Page No. Rev No. 77............................................. 28 241 – 244 ................................ 29 3 – 18.......................................25 78 – 83..................................... 29 245/246 ................................... 29 19............................................. 29 84 – 88..................................... 28 247 – 250 ................................ 29 20 – 30..................................... 25 89/90........................................ 28 251/252 ................................... 29 91 – 97..................................... 28 253 – 262 ................................ 29 Chapter