~BEING 

Septem er 12, 21)14 

B-H210-14-00475 

Docket Management Facility 

U.S. Department of Tran portation 

400 Seventh Street SW 

as if Building, Room PL-40 1 

Wa hington, DC 20590 

Attention: Airworthine s Rule Docket No. FAA-2014-0522 

T11e BoPill'J Cotnp tn' 

PO B X '101 

::;, ltt'F. 1...,"1 o1~ I-2:,JI 

Subject: Comments, NPRM Docket No. FAA-2014-0522 (Directorate identifier 

2014-NM-087-AD): Inspection of the MED Door 1 fuselage skin 

cutout for cracking, Airplane Model 747 

Boeing has reviewed the ubject NPRM and provide the enclosed comment '. 

Very truly your , 

K. R. Guiley 

Manager, Continued Airworthine 

Twin Ai le Program 

B-H210, M/C OA-19, (425) 266-5697 

FAX: (425) 342-1058 

MDM 

Encloc ure: Comments, 2 pages 
Comment# 1 

What doe the 

commenter request 

How is the request 

justified? 

List paragraphs that 

change; de cribe (nonobvious) changes 

Comment# 2 

What does the 

commenter request 

How is the request 

justified? 

List paragraphs that 

change; describe (nonobvious) changes 

Comment# 3 

What does the 

commenter request 

How is the request 

justified? 

List paragraphs that 

change; describe (nonobvious) change 

Ecnlosure to B-H210-14-00475 

1 of 2 

Boeing Proprietary September 5, 2014 

747-CSE-14-057 

In the preamble section, summary paragraph add the word "fusel age 

skin" to clarify that the cracking occurs in the fuselage skin panel 

assy. 

The wording in the summary a written appear as the cracking is 

occurring on the main entry door #I (MED #1 ). 

SUMMARY: We propose to adopt a new airworthiness 

directive (AD) for certain The Boeing Company Model 747-

100, 747 - 1008 , 747-1008 SUD, 747-2008, 747-200C, 747 -

200F, 747 - 300, 747-400, 747-400D, 747-400F, 747SR, 

and 747SP series airplanes. This proposed AD was 

prompted by reports of fuselaae skin ass~ cracks at the 

lower forward corner of the main entry door (MED) 1 

cutout . This proposed AD would require r epetitive 

inspections of the fuaela~e skin ass~ P4S±:l else:!? ± for 

cracking , and repair if necessary. This proposed AD also 

provides optional terminating modification; and would 

require postrepair or post-modification inspections for 

cracking, and corrective 

actions if necessary . We are proposing this AD to detect 

and correct skin cracking, which can become large and 

could adversely affect the structural integrity of the 

airplane. 

In the preamble section, discus ion paragraph add the word "fuselage 

skin" to clarify that the cracking occurs in the fuselage skin panel 

assy. 

To clarify that the cracking occurs on the fuselage skin panel assy. 

Discussion 

We have received reports of fuselage skin assy cracks 

the lower forward corner of the MED 1 cutout on two 

airplanes . A 1.0-inch crack in the skin and bearstrap 

was found on an airplane with 17,605 total flight 

cycles. A 5. 0- inch crack was found in the skin ... 

In par (e) add the word "fuselage skin" to clarify that the cracking 

occurs in the fuselage skin panel assy. 

To clarify that the cracking occurs on the fuselage skin panel assy. 

(e) Unsafe Condition 

This AD was prompted by reports of fuselage skin a ssy 

cracks at the lower forward corner of the main 

door (MED) 1 cutout. We are issuing this AD 

Page 2 of 3 

ECCN • 9E991 

entry 

at 

NO LICENSE IS REQUIRED FOR THE DISSEMINATION OF THE COMMERCIAL INFORMATION 

CONTAINED HEREIN TO FOREIGN PERSONS OTHER THAN THOSE FROM OR IN TERRORIST 

SUPPORTING COUNTRIES IDENTIFIED IN THE EAR. IT IS THE RESPONSIBILITY OF THE 

INDIVIDUAL IN CONTROL OF THIS DATA TO ABIDE BY U.S. EXPORT LAWS. 
Comment# 4 

What does the 

commenter request 

Howi the reque t 

justified? 

List paragraphs that 

change; describe (nonobvious) change 

Comment# 5 

What does the 

commenter request 

How is the reque l 

justified? 

List paragraphs that 

change; de cribe (nonobvious) changes 

Ecnlosure to B-H21 0-14-00475 

2 of 2 

Boeing Proprietary September 5, 2014 

747-CSE-14-057 

In par (g) add the word "fuselage skin" to clarify that the cracking 

occurs in the fuselage skin panel assy. 

To clarify that the cracking occur on the fu elage skin panel assy. 

(g) Repetitive Inspections and Corrective Actions 

Except as specified in paragraph (j) (1) of this AD, at 

the applicable time specified in paragraph 1.E., 

··compliance, 1 1 of Boeing Alert Service Bulletin 747-

53A2863, dated March 11, 2014: Do a detailed inspection 

and a surface high frequency eddy current inspection £!.... 

the fuselage skin assy for cracking &f at the applicable 

main entry door 1; and do all applicable corrective 

actions; in accordance with the Accomplishment 

Instructions of Boeing Alert Service Bulletin 747-

53A2863, dated March 11, 2014. Do all applicable 

corrective actions before further flight. Repeat the 

inspections of the fuselage skin assy at the applicable 

main entry door 1 thereafter at the intervals specified 

in paragraph 1.E., ··compliance, 1 1 of Boeing Alert 

Service Bulletin 747 - 53A2863,dated March 11, 2014. 

Accomplishing the corrective actions required by this 

paragraph terminates the repetitive inspection 

requirements of this paragraph. 

In par (i) add the word "fu elage skin" to clarify that the cracking 

occurs in the fuselage skin panel assy. 

To clarify that the cracking occurs on the fuselage kin panel assy. 

(i) Post-Repair or Post-Modification Repetitive 

Inspections and Corrective Actions 

For airplanes on which the corrective actions required 

by paragraph (g) of this AD have been done, or airplanes 

that have installed the preventive modification 

specified in paragraph (h) of this AD: At the applicable 

time specified in paragraph 1.E.,"Compliance,•• of 

Boeing Alert Service Bulletin 747-53A2863, dated March 

11, 2014, do a detailed inspection for fuselage skin 

assy cracking &f !! the applicable main entry door 1; 

and do all applicable corrective actions; 

Page 3 of 3 

ECCN • 9E991 

in accordance ... 

NO LICENSE IS REQUIRED FOR THE DISSEMINATION OF THE COMMERCIAL INFORMATION 

CONTAINED HEREIN TO FOREIGN PERSONS OTHER THAN THOSE FROM OR IN TERRORIST 

SUPPORTING COUNTRIES IDENTIFIED IN THE EAR. IT IS THE RESPONSIBILITY OF THE 

INDIVIDUAL IN CONTROL OF THIS DATA TO ABIDE BY U.S. EXPORT LAWS.