MAINT E 3900 N. Mi n Tulsa, OK 7 April 4, 2

U.S. Dep a Docket O West Bu i 1200 Ne w Washing
Subject:

Referen c 1) B 2) D 3) 7

AAL has r

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n go Rd. 4116

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a rtment of T O perations M

i lding Grou n w Jersey Av e t on, DC 205

Docket No.

c es: oeing Servi c D ocket No. F A

77 AMM 78

r eviewed th

rior to the r e lates on the

m anufacture

x haust plug riginal part n D O NOT SEP A

s specified i n ef.1.

herefore, A A ption of re
‐ i umber iden t ontinuous A

e vel of safet y

rior to relea perators, A A ut of the 3/ 1 A s a result, A

n equivalen t

r overhaul s
n addition, t h E NGINEERI N

T ransportati M

‐ 30
n d Floor, Ro o e nue SE. 9 0

FAA

‐ 2014

‐ 0

c e Bulletin 7 7 A A

‐ 2014

‐ 01 2

‐ 11

‐ 02

‐ 400

‐

e Ref. 2 NP R

e lease of R e forward an
r part numb skin at man
n umber, a c o A RATE”. Th e
n Ref.1, ho w

A L requests dentifying t h t ity in accor d A irworthine s y

.

se of Ref. 1, A L recogniz e 1 6” nutplat e A L impleme t level of sa f hop visit, th h e holes ar e N G

on

o m W12

‐ 14 0

0 128; Direct o

7 7

‐ 78

‐ 0051 , 2 8; Director 803

‐ R00

R M and sub m

e f. 1, AAL im p

d aft exhau s
er and seria ufacture, w e
o mpany ass
e installed i d

w ever, they a

t hat Ref. 2. S h e exhaust p d ance with a
s s Maintena n

and due to

e d that mult i

e locking fea

nted a mai n f ety as Ref. 1

e pre Ref. 1

e inspected f 0

o rate Identi f

Revision 3, ate Identifi e

m its the foll o

p lemented a
s t plug. The s l number, w
e re no long e igned serial d entification

a re a differe

S ection 2.(i) p lug with th e
a method a p
n ce Progra m

reported e v i ple remova l ture, which

n tenance pr o 1

. During e v

exhaust aft f or elongati o f ier 2013

‐ N M

dated Aug u
e r 2013

‐ NM

‐

o wing com m

a maintena n
s e plates we
w hich were c
e r legible. T h

number an d plates are i nt length th a

includes la n
e correct p o p proved by t

m (CAMP), a s

v ents of exh a ls of the ex h could then r
o gram as pa r
v ery engine r

plugs nutpl a
o n and crac k M

‐ 133

‐ AD

u st 23, 2012

‐ 133

‐ AD

m ents:

n ce program
re installed

c hemical

‐ et c h e data plat e d the text “ M nstalled in t

an the plat e

n guage that

o st service b u t he operato r
s that provi d

a ust plug lo s h aust aft plu g
r esult in los s rt of our CA M

r emoval for

a tes are rep k s IAW proc e to install d a because th e
c hed on the

e s contain t h M ATCHED S E he same loc

e s required b

allows the

u lletin part

r ’s approve d d es an equiv a

s s by other g causes we
s of the aft p M P which o f

a refurbish m lace with n e
e dures a ta

e

h e E T. ation b y

d

a lent

e ar
‐ p lug. f fers

m ent

e w.2 e
e x
m
u

A h d A

w S e

I f

a
u f r

3. P p p 1

a f o p

T

a P

r e A

4. R

e x

...

quivalent t o
x haust plug , m et. In addi t

sing a ladde

A AL are curr e

ave not lost escribed m a A AL requests

w ith the abo v

e rviceable A

f the FAA do bove descri b ntil the nex t

r om the eff e

rior to relea lug mate lin rovided by B 4 CFR Part 1

c cordance w
o llowed Bo e roposed AD

herefore, A A

c complishe d art 121.379 , e pairs in th e A MOC appro v

ef. 2. (j) sta t

x haust plug

... .AD require o SB 777

‐ 78

‐ 0

, Ref. 3 req u t ion, each o f r/stand and

e ntly the lar g

an exhaust

a intenance p

that any pr e
v e describe d A ssembly.

not agree, A b ed mainte n t engine re m
e ctive date o

se of this N P

e during ins B oeing with o 1 21.379. Pa r
w ith paragra

ing repair i n

.

A L requests d to the exh a

, or Boeing O

e AD withou t

v al in accor d

t es that “As

assembly m
s complian c 0 051 inspec

u ires that th e f the exhaus

a bright lig h

g est 777

‐ 20 0 aft plug du e p rogram de m
e Ref. 1 ex h d maintenan

A AL request

n ance progr a
m oval for ref u
o f the AD, w h

P RM, exhau s pection or d

o ut Boeing O

r agraph (h) o ph (k) AMO C

n structions, t

t hat paragr a
a ust aft plu g O DA, prior t o t the requir e d ance with p

of the effec t

m ay be instal

c e within th e tion proced u
e minimum t aft plug fa s h t every 15 0

0 Trent 800 o
e to loose or
m onstrates a h aust aft plu g

ce program

that pre Re f

a m be auth o
u rbishment h ichever is l a

s t aft plugs h d uring incor p O DA approv a
o f Ref. 2 req C s. Since th e t hey offer a n

a ph (h) be a m g IAW Boein g
o the releas e
e ment of ob t p aragraph ( k

t ive date of t led on any a
e applicable t ures. Durin g fastener ru n
s teners rec e 0 flight hour s

operator in

r missing fas t

a n equivale n g s which ar e be added t o

f

. 1 exhaust

o rized by th e

or overhaul

a ter.

h ave receiv e p oration of R

a l, rather, t h uires using a
ese previou s
n equivalen t

m ended to a g instructio n
e of the AD b t aining Boei k ).

this AD, onl y
a irplane” w h time after t h g every inst a
n
‐ on torque

e ive a gener a
s

.

the worldw i t eners, as t h

n t level of sa
e maintaine d

o Ref. 2 (h) D

aft plugs m
e AD to rem a

shop visit, o

e d repairs at R ef. 1 utilizi n h e repair wa
a repair me t

s ly accompl i t level of saf

a llow repair s
n s and appr o b e included ng ODA AM

y a servicea b h ile Ref. 2. (i ) h e effective a llation of t h of 2 in

‐ lbs i s
a l visual che

i de fleet an d h e above fety. There f d in accorda D efinition o f

m aintained b y

a in in

‐ servic

o r 60 mont h

t the exhaus t

n g procedur e
s approved t hod appro v i shed repair s f ety to the

s previously

o ved per 14 C

as accepta b OC or SACO

b le turbine ) states that date of this h e aft

s ck

d

f ore,
nce f a

y the

e h s

t aft

e s per
v ed in

s

C FR b le

“ AD”.3 A

r e

A t h A

If you ha Manage r Regards,

John Be a A s written, t h

e quired by t

A AL requests

h is AD, you m A ssembly re q

ve any ques r Power Pla n

a vers h ese steps a r he AD are d

that Ref.2 p
m ay only re p q uirement o f

tions, com m n t Engineeri n r e confusin g
ue as of the

p aragraph 2

. p lace the ex f Ref. 2 para

m ents or con n g, at Ken.H i g and could l

effective d a

. (j) be revis e h aust plug w graph (h)”.

cerns, plea s i ll@aa.com o ead the op e
a te of this A D

e d to state “ A

w ith one tha

s e feel free t
o r by phon e e rators to b e D

.

A s of the ef f t meets the

t o contact K e e at (817) 22 4 e lieve the a c

f ective date

Serviceabl e

e n Hill, Sr. 4 –0225. c tions

of

e