# ~BEING
Septem er 12 , 21)14
B-H210

- 14-00475
Docket Management Facility U

.S

. Dep artment 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 ub ject 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 FA X : (425) 342-1058 MDM Enclo c ure : Comments, 2 pages

## Comment# 1 What doe the commenter request How is the request j ustified? List paragraphs that change; de cribe (nonobvious) changes



## Comment# 2 What does the commenter request How is the re quest justified? Lis t paragraphs that change; describe (nonobvious) changes



## Comment# 3 What does the commenter request How is the requ est justified? List paragraphs that change; describe (nonobvious) ch ange Ecnl os ure to B-H2 1 0
- 1 4
-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 (ME D #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 fus elage skin panel assy. To clarify that the cracking occurs on the fuselage skin panel assy. Discussion We have received reports of fuselage skin ass y 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 "fu selage skin " to clarify t hat the cracking occurs in the fuselage skin panel assy. To clarify th at the cracking oc curs on the fuselage skin panel assy . (e) Unsafe Condition This AD was prompted by reports of fuselage skin a s sy cracks at the lower forward corner of the main door (MED) 1 cutout. We are issuing this AD 

### Page 2 of 3 E CCN • 9E991 entry at

NO LICENSE IS REQUIRED FOR THE DISSEMI NATION OF THE COMMERCIAL INFORMATION CONTA INED HEREIN TO FOREIGN PERSONS OTHER THAN THOSE FROM OR IN TERRORIST

SUPPORTING COUNTRIES IDENTIFIED IN THE EAR. IT IS THE RESPONSIBILITY OF TH E 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 (non

obvious) changes Ecn losure to B-H2 10-14-00475 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 ski n 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.