1999 q2-advanced maintenance techniques for the 757-300

8/13/2019 1999 Q2-Advanced Maintenance Techniques for the 757-300

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Advanced Maintenance Techniques for the 757-300

The Boeing 757-300 airplane is the first major derivative in the 757family. With additional equipment and several new features it providesoperators with in!reased passenger !apa!ity and improved operating

e!onomi!s over the 757-"00. The 757-300 in!orporates the latestadvan!es in te!hnology # many of whi!h are used in other Boeingmodels # sin!e the development of the 757-"00 in the late $%70s.&perators of the 757-300 should 'e aware of these advan!es and thea!!ompanying maintenan!e te!hniques to help them a!hieve thehighest possi'le dispat!h relia'ility with this derivative.

(s the su!!essor to the highly relia'le Boeing 757-"00 the 757-300 in!orporatesnew and proven te!hnology used on the 737-)00*-700* -+00*-%00 777 and otherairplanes throughout the Boeing fleet. ,hanges in!lude upgraded 'uilt-in testequipment and related revisions to manuals and system ar!hite!ture to helpoperators su!!essfully trou'leshoot pro'lems esta'lish the required preventivemaintenan!e and maintain a high dispat!h rate. n addition new maintenan!ete!hniques have 'een adapted from the latest Boeing models for use on the 757-300. The te!hnology maintenan!e and system improvements on the 757-300are found in several !ategories

$. Built-in test equipment.". (ir data inertial referen!e system.3. /a!uum lavatories.

. Tail s1id. 5. 2aw damper*sta'ili er trim module.). 4lap slat a!!essory module and flap s1ew dete!tion system.

1. Built-In Test Equip entBuilt-in test equipment B T6 on the newest line repla!ea'le units 89: in the757-300 follows the method-ology set on the 737-)00*- 700*-+00*-%00 and 777

fig. $ . ;uring development of the 777 a methodology for presentation and!ontent of B T6 was developed. This spe!ifi!ally defines how a front-panel B T6will operate and how the me!hani! will use it. The new front-panel B T6
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in!orporates features that were agreed upon 'y airline me!hani!s and Boeing!hief me!hani!s human fa!tors e


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( new !apa'ility on the 757-300 allows for qui!1 dispat!h if a primary (;,fun!tion fails. This is availa'le in the form of the !enter (; 9: air data fun!tionwhi!h is used as a warm spare for either the !aptain>s or the first offi!er>sinstruments. The main equipment !enter !ontains two swit!hes to dire!t the!enter (; 9: air data !omputer information to either the !aptain>s or the first

offi!er>s instrument panel. =ele!ting the !enter mode for either the left or the rightside swit!hes the !enter (;, fun!tion to that side.

3. &acuu 'avatoriesThrough lessons learned with previous Boeing models the 757-300 in!ludesimprovements for a state-of-the-art va!uum lavatory system. ,ommonality ofe


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inserting $*+-in rods similar to pros minimum equipment list. f the !artridge is!rushed 'eyond the upper inspe!tion hole then additional stru!tural inspe!tionsmay 'e required along with repla!ement of the !artridge 'efore the ne


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and display the fault !ondition in a maintenan!e message format on the 2=?front-panel B T6. The me!hani! !an now use the maintenan!e message inde< inthe 4 ? to !ontinue trou'leshooting and find the failed !omponent. The!omponents were designed as 89:s for easy maintenan!e in !ase of failure.

Elevator feel shift odule /E $M .The 64=? is a new !omponent on the 757-300 and is identi!al to the 64=? onthe 737-)00*-700*-+00*-%00. t was installed to !omply with the latest regulatoryrevisions to !ertifi!ation requirements for stall identifi!ation. When full airplanestall is en!ountered hydrauli! pressure in!reases 'etween the 64, and the feeland !entering unit. This in!reases the !olumn for!e gradient or DstiffnessD andresults in a nosedown airplane response that aids in stall re!overy.

2. lap $lat Accessor% Module and lap $)e+ "etection $%steThe 757-300 has in!orporated a flap s1ew dete!tion system. 4lap s1ew o!!urswhen either the in'oard or out'oard edge of the flap moves farther than the rest

of the flap. The flap s1ew dete!tion system monitors dete!ts and shuts downthe flaps if a s1ew !ondition o!!urs. The heart of this system is the flap slata!!essory module 4=(? ta1ing the pla!e of the flap slat ele!troni! unit 4=6:num'er 3. The new 89: was introdu!ed 'e!ause the e


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Launch customer Condor Flugdienst took delivery of the first 757-300 in March1999 ! "#

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Eric hite,hief ?e!hani! - =tandard-Body @rograms$ervice En4ineerin4Boeing ,ommer!ial (irplanes Eroup


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1999 q2-advanced maintenance techniques for the 757-300

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