Re: FAA AD NPRM- TCCAAD CF2001-42/ ASB 407-11-95 (Top Skin and 

Upper UH Longeron) '] 

Hi Luc. 

Sharon Y Miles to: Murphy, Luc ASW-111 , Regulations & Policy Group 

Cc: Jim Grigg 

I believe all the documents (Bell ASB, TCCA, and FAA) are in agreement. 

04/22/2014 10:31 AM 

Per the NPRM required actions (e)(3) replacing the longeron assembly with longeron assembly, 

P/N 206-031-314-237B, and installing three external strap doublers constitutes terminating 

action for this AD. It is understood that the AD inspections no longer apply. and the inspections, 

if any, would be per the maintenance manual. 

Per the requirements of (e)(4), if there is no crack in the upper skin and there is no crack, 

corrosion, or other damage in the longeron assembly, you may install three external strap 

doublers in accordance with part Ill of the ASB. This option extends the recurring 50 hours TIS 

to 150 hours TIS. This is the same as ASB 407-11-95, which also states in two separate notes 

that to benefit the replacement of the 50 hour intervals to 150 hour intervals, by installing the 

strap doublers, the longeron and top skin must be free of defects and shall not carry any type of 

repair. 

Per the NPRM requirements of (e)(1 )(ii)(A), if there is a crack, before further flight, replace the 

longeron with specific longeron p/n or repair the longeron. If the longeron is repaired and the 

strap doublers are installed, the inspections remain at 50 hour intervals based on the ASB note 

(not eligible for 150 hour interval due to repairs) and NPRM requirements of (e)(1 )(C). If the 

longeron is replaced and strap doublers are installed, this action constitutes terminating 

action(e)(3). 

Per NPRM requirements of (e)(2) that allows you to delay longeron inspection 10 hours if no 

skin damage detected- if there is a crack in the longeron, NPRM (e)(2)(i) specifies that you may 

replace with specific longeron part number and install strap doublers or repair the longeron and 

install strap doublers. If the longeron is replaced and strap doublers are installed, this action 

constitutes terminating action(e)(3). If repaired, the 50 hour interval continues because if 

repaired, it is not eligible for expanding the interval to 150 hours due to repairs according to the 

ASB. 

If you have any questions or need additional information, please let me know. 

Best regards. 

Regulations and Policy Group 

Rotorcraft Standards Staff 

817-222-5122 (office) 817-222-5961 (FAX) 
We value your feedback. Click here to tell us how we are doing 

"Murphy, Luc" Hi Sharon, I have posted the following comment. .. 

From: 

To: 

"Murphy, Luc" <lmurphy@bh.com> 

ASW-111 , Regulations & Policy Group 

Sharon Y Miles/ASW/FAA@FAA, 

03/04/2014 12:38:24 PM 

Cc: 

Date: 

"Deer, Michael" <mdeer@bh.com>, "Gajewski, Bogdan" <bogdan.gajewski@tc.gc.ca> 

03/04/2014 12:38 PM 

Subject: FAA AD NPRM- TCCA AD CF2001-42 I ASB 407-11-95 (Top Skin and Upper UH Longeron) 

Hi Sharon, 

I have posted the following comment on regulations.gov regarding the subject NPRM : 

[Docket No. FAA-2014-0070; Directorate Identifier 2011-SW-062-AD] 

RIN 2120-AA64 

Airworthiness Directives; Bell 

Helicopter Textron Canada Helicopters 

You were cited as the contact person in the NRPM 

******** 

The proposed AD is more restrictive than the TCCA Airworthiness Directive or the Bell ASB without 

providing a rationale for the lower inspection intervals. 

As currently worded, the NPRM imposes the following inspection intervals: 

1. If no strap doublers or new Ionge ron is installed, the inspection interval is 50 hrs. 

2. If the strap doublers (but not the new longeron) are installed, the inspection interval remains at 50 

hrs. 

3. If the strap doublers and the new longeron are installed (terminating action), the inspection interval 

is 150 hrs. 

The TCCA AD and Bell ASB impose the following inspection intervals: 

1. If no strap doublers or new longeron is installed, the inspection interval is 50 hrs. (NPRM agrees with 

TCCA AD and ASB) 

2. If the strap doublers (but not the new longeron) are installed, the inspection interval is increase to 

150hrs. 

3. If the strap doublers and the new longeron are installed (terminating action), the inspection interval 

returns to the normal chapter 5 requirement of 300 hrs. 

In all cases, it is assumed that there is no crack in the upper skin or the Ionge ron. 

Other aspects of the NRPM are acceptable. 

The lower inspection intervals will impose an additional burden to operators without any additional 

safety benefits. 

********* 
Best regards 

Luc Murphy, ing., PMP 

Airworthiness Office 

Bell Helicopter Textron Canada 

lmurphy@bh.com 

(450) 971-6500 ext. 6783 

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