rti--BOEINGOCT2014777MAINTENANCEPLANNINGDATA777MAINTENANCEPLANNINGDATA(MPD)DOCUMENTSECTION9AIRWORTHINESSLIMITATIONS(AWLs)ANDCERTIFICATIONMAINTENANCEREQUIREMENTS(CMRs)D622W001-9OCTOBER2014COMPILEDANDPUBLISHEDBY:MAINTENANCEPROGRAMSENGINEERINGCOMMERCIALAVIATIONSERVICESBOEINGCOMMERCIALAIRPLANEGROUPSEATILE,WASHINGTOND622W001-9BOEINGPROPRIETARY-Copyright(c)-UnpublishedWork-SeetitlepagefordetailsPage9.0-1rp._aoEING

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777 MAINTENANCE PLANNING DATA TABLE OF CONTENTS REVISIONS

9.0-5 LIST OF EFFECTIVE PAGES

9.0-20 A. SCOPE

9.0-21 B . AIRWORTHINESS LIMITATIONS- STRUCTURAL INSPECTIONS ....... .. ........

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..... ..... ..... 9 . 0-22 C . AIRWORTHINESS LIMITATIONS- STRUCTURAL SAFE-LIFE LIMITS

9 . 0-108 D . AIRWORTHINESS LIMITATIONS- SYSTEMS ....

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..... .... .......... 9.0-114 D.1 FUEL SYSTEMS IGNITION PRE V ENTION

8 D
.2 ENGINE SUCTION FEED SYSTEM

9.0-136 D
. 3 NITROGEN GENERATION SYSTEM

9 . 0-138 D
.4 PRATT AND WHITNEY FORWARD STRUT DRAIN LINE

9 . 0-143 D
. 5 ROLLS ROYCE THRUST REVERSER THERMAL PROTECTION SYSTEM

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. ............ 9.0-145 E . CERTIFICATION MAINTENANCE REQUIREMENTS

( CMRs

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9 . 0-148 F. CERTIFICATION MAINTENANCE REQUIREMENTS TASKS

9 .0 -154 G . REPORTING UNCONTROLLABLE HIGH THRUST FAILURE CONDITIONS

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777 MAINTENANCE PLANNING DATA D.4 PRATT AND WHITNEY FORWA R D STRUT DRAIN LINE This section contains an FAA approved program of Forward Strut Drain Line Scheduled inspections

. Operators should incorporate these inspections into their maintenance programs to meet Title 14 CFR § 25.901(b) (2) for those strut drains that are identified as applicable

. In revenue service

, excessive temperatures combined with draining fluids have contributed to clogging of the forward strut drain line. Hydraulic fluid has poo

l ed

i n the strut flammable leakage zone

, the left systems
e l ectrical bay
,in the strut forward dry bay, and forward engine mount. The titanium engine mount is susceptible to hydrogen embrittlement when exposed to hydraulic fluid. The addition of drain line in sulation

( see Service Bulletin 777-71-0055

) reduces the temperatures experienced by the drain lines minimizing the clogging of the drain such that periodic inspection wi ll prevent clogging and pooled flammable fluids between inspections

. The Forward Strut Drain Line functiona

l check AWL is mandatory maintenance
to ensure safe operation of the strut drainage system as required by T
i tle 14 CFR § 25

. 901 (b)(2}

. The Forward Strut Drain Line functional check ver

i fies the drain w ill be functional until the next scheduled inspection

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777 MAINTENANCE PLANNING DATA AWLs

- DRAIN LINE AWL NUMBER TASK INTERVAL APPLICABILITY DESCRIPTION 54-AWL-01 All

2 , 000 FC / 777 Airplanes Forward Strut Drain Line 1 , 500 DY Line Number Concern: Potential for hydraulic fluid c l ogging the Fo rward Strut drain line caus

i ng subsequent dogging of NO TE 1118 and on the Left Systems Disconnect. Strut Fo rw ard Lo w er Spar Inlet and Fo rward F ir e Sea

l Pan In
l et w hich could w i1h PW4000 result in pooled flammable fluid in a flammable leakage zone whi ch poses a potentia

l fire hazard

. engines Hydrau

li c F luid can a l so back up into the strut fo rw ard dry bay and cause
h y drogen embrittlement of the 777 Airplanes forward eng ine mount fittings that cou

l d cause cracks that

l ead to the

l oss of load carry

i ng capability for the fo rw ard eng in e mount. Line Numbers 1 through 1117 Perform
a Fo rw ard Strut Drain Line Functional Check

( refer to Boeing AMM 54-55-0 1) to ensure the dra

i n w ith PW4000 has sufficient flo w. engines

1. Apply 381o z (11. 27 I) to 387 oz (1 1 . 44

I ) of w ater into the strut disconnect bo x over a 45 to 90 second that have period

. i ncorporated Service Bulletin

2 . V erify a m

i n i mum of 354 oz ( 10.471

) is collected wi th in tw o minutes after pou ri ng w ater is comp

l ete
. 777-71-0055

3 . If the flo w requirement
is not met then add iti onal checks are required to v erify the fo ll o w ing
: a . V e rify that the three drain

l ines that connect to the Fo rw ard Strut drain line are c l eared of blockage from the drain outlet to the follo wi ng

i nlets

: Left Systems
D
i sconnect

, Strut Fo rw ard Lo w er Spar Inl et and Fo rw ard Fire Seal Pan Inl e t. b . V erify that there is no evidence of hydraulic fluid contaminat

i on in the strut forward dry bay
. NOTE

: Access is t hrough 432AR or 442AR. The Boeing Service Bu ll etin 777-54-0028 contains accepted practices for insp ec tion

, clean ing and refinishing of the strut forward dry bay
. I nterval Note: Whi chever comes first. ------

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