MAINTE

3900 N. Min

Tulsa, OK 7

April 4, 2

U.S. Depa

Docket O

West Bui

1200 New

Washing

Subject:  

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2) D

3) 7

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ENANCE & E ngo Rd. 

4116 

2014

artment of T

Operations M

ilding Groun

w Jersey Ave

ton, DC 205

Docket No.

ces:  

oeing Servic

Docket No. FA

77 AMM 78

reviewed th

rior to the re

lates on the

manufacture

xhaust plug

riginal part n

DO NOT SEPA

s specified in

ef.1.   

herefore, AA

ption of re‐i

umber ident

ontinuous A

evel of safety

rior to relea

perators, AA

ut of the 3/1

As a result, A

n equivalent

r overhaul s

n addition, th

ENGINEERIN

Transportati

M‐30

nd Floor, Roo

enue SE.

90

FAA‐2014‐0

ce Bulletin 77

AA‐2014‐012

‐11‐02‐400‐

e Ref. 2 NPR

elease of Re

forward an

r part numb

skin at man

number, a co

ARATE”.  The

n Ref.1, how

AL requests

dentifying th

tity in accord

Airworthines

y.   

se of Ref. 1,

AL recognize

16” nutplate

AL impleme

t level of saf

hop visit, th

he holes are

NG 

on

om W12‐140

0128; Directo

77‐78‐0051,

28; Director

803‐R00

RM and subm

ef. 1, AAL imp

d aft exhaus

er and seria

ufacture, we

ompany ass

e installed id

wever, they a

that Ref. 2. S

he exhaust p

dance with a

ss Maintenan

and due to

ed that multi

e locking fea

nted a main

fety as Ref. 1

e pre Ref. 1

e inspected f

0

orate Identif

Revision 3,

ate Identifie

mits the follo

plemented a

st plug. Thes

l number, w

ere no longe

igned serial

dentification

are a differe

Section 2.(i)

plug with the

a method ap

nce Program

reported ev

iple removal

ture, which

ntenance pro

1.  During ev

exhaust aft

for elongatio

fier 2013‐NM

dated Augu

er 2013‐NM‐

owing comm

a maintenan

se plates we

which were c

er legible. Th

number and

plates are i

nt length tha

includes lan

e correct po

pproved by t

m (CAMP), as

vents of exha

ls of the exh

could then r

ogram as par

very engine r

plugs nutpla

on and crack

M‐133‐AD

ust 23, 2012

‐133‐AD

ments:

nce program

re installed

chemical‐etc

he data plate

d the text “M

nstalled in t

an the plate

nguage that

ost service bu

the operator

s that provid

aust plug los

haust aft plug

result in loss

rt of our CAM

removal for

ates are rep

ks IAW proce

to install da

because the

ched on the

es contain th

MATCHED SE

he same loc

es required b

allows the

ulletin part

r’s approved

des an equiva

ss by other

g causes we

s of the aft p

MP which of

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lace with ne

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ata

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quivalent to

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met.  In addit

sing a ladde

AAL are curre

ave not lost

escribed ma

AAL requests

with the abov

erviceable A

f the FAA do

bove describ

ntil the next

rom the effe

rior to relea

lug mate lin

rovided by B

4CFR  Part 1

ccordance w

ollowed Boe

roposed AD

herefore, AA

ccomplished

art 121.379,

epairs in the

AMOC approv

ef. 2. (j) stat

xhaust plug

....AD require

o SB 777‐78‐0

,  Ref. 3 requ

tion, each of

r/stand and

ently the larg

an exhaust

aintenance p

that any pre

ve described

Assembly.  

not agree, A

bed mainten

t engine rem

ective date o

se of this NP

e during ins

Boeing witho

121.379.  Par

with paragra

ing repair in

.   

AL requests

d to the exha

, or Boeing O

e AD without

val in accord

tes that “As

assembly m

s complianc

0051 inspec

uires that the

f the exhaus

a bright ligh

gest 777‐200

aft plug due

program dem

e Ref. 1  exh

d maintenan

AAL request

nance progra

moval for refu

of the AD, wh

PRM, exhaus

pection or d

out Boeing O

ragraph (h) o

ph (k) AMOC

nstructions, t

that paragra

aust aft plug

ODA, prior to

t the require

dance with p

of the effect

may be instal

ce within the

tion procedu

e minimum

t aft plug fas

ht every 150

0 Trent 800 o

e to loose or

monstrates a

haust aft plug

ce program

that pre Ref

am be autho

urbishment

hichever is la

st aft plugs h

during incorp

ODA approva

of Ref. 2 req

Cs.  Since the

they offer an

aph (h) be am

g IAW Boeing

o the release

ement of obt

paragraph (k

tive date of t

led on any a

e applicable t

ures.  During

fastener run

steners rece

0 flight hours

operator in

r missing fast

an equivalen

gs which are

be added to

f. 1 exhaust

orized by the

or overhaul

ater.     

have receive

poration of R

al, rather, th

uires using a

ese previous

n equivalent

mended to a

g instruction

e of the AD b

taining Boei

k).  

this AD, only

airplane” wh

time after th

g every insta

n‐on torque

eive a genera

s.   

the worldwi

teners, as th

nt level of sa

e maintained

o Ref. 2 (h) D

aft plugs  m

e AD to rema

shop visit, o

ed repairs at

Ref. 1 utilizin

he repair wa

a repair met

sly accompli

t level of saf

allow repairs

ns and appro

be included

ng ODA AM

y a serviceab

hile Ref. 2. (i)

he effective

allation of th

of 2 in‐lbs is

al visual che

ide fleet and

he above

fety.  Theref

d in accorda

Definition of

maintained by

ain in‐servic

or 60 month

t the exhaust

ng procedure

s approved

thod approv

ished repairs

fety to the

s previously

oved per 14C

as acceptab

OC or SACO

ble turbine

) states that

date of this

he aft

s

ck

d

fore,

nce

f a

y the

e

hs

t aft

es

per

ved in

s

CFR

ble

“

AD”.
 3 

A

re

A

th

A

If you ha

Manager

Regards,

John Bea

As written, th

equired by t

AAL requests

his AD, you m

Assembly req

ve any ques

r Power Plan

avers

hese steps ar

he AD are d

that Ref.2 p

may only rep

quirement of

tions, comm

nt Engineerin

re confusing

ue as of the

paragraph 2.

place the ex

f Ref. 2 para

ments or con

ng, at Ken.Hi

g and could l

effective da

.(j) be revise

haust plug w

graph (h)”.  

cerns, pleas

ill@aa.com o

ead the ope

ate of this AD

ed to state “A

with one tha

  

se feel free t

or by phone

erators to be

D.  

As of the eff

t meets the

to contact Ke

e at (817) 224

elieve the ac

fective date

Serviceable

en Hill, Sr.

4 –0225.   

ctions

of

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