Richard, There’s no safety concern with partially deactivating the air conditioner by removing the compressor drive pulley and belt. Regarding the wording of the terminating action so that it covers our possible solution paths we suggest only a minor addition to your statement:

“ Replacing the Air Comm pulley with Airbus output flange, part number C632A2158201, and fully or partially deactivating the air conditioning system (partially deactivating means the evaporator blowers are still operable), constitutes terminating action for this Emergency AD unle ss and until a future Service Bulletin from ACC is issued”.

Thanks,

Jim Byrnes

Air Comm Corporation www.aircommcorp.com 1575 W. 124 th Ave. Westminster CO 80234 Phone

- 303

- 440

- 4075 x248 Fax

- 303

- 440

- 6355

F rom: Richard.R.Thomas@faa.gov [ mailto:Richard.R.Thomas@faa.gov ]
Sent: Friday, April 01, 2016 11:25 AM
To: Jim Byrnes
Cc: Matthew.Bryant@faa.gov ; Courtney.Liedler@ntsb.gov ; Eugene.Trainor@faa.gov Subject: Spline Coupling AD

Jim

We are w orking on publishing AD 2015

- 24

- 51 in Federal Register as a final rule. The terminating action
in the AD reads as follows:

Replacing the Air Comm pulley with Airbus output flange, part number C632A2158201, and fully or partially deactivating the air cond itioning system (partially deactivating means the evaporator blowers are still operable), constitutes terminating action for this Emergency AD.

I know you are working on a design change to operate the compressor off of a different (less critical)
power ta keoff and that this would include replacing your pulley and reinstalling the Airbus output flange. That action is consistent with part of this terminating action but it would reactivate the air conditioning system which is slightly inconsistent with this terminating action. Rather than revise the AD at some future time to incorporate your design change which would reactivate the air conditioning system, I would like to find a way to change this statement in a manner which would consider your possible desi gn change.

With this in mind, if you replace your pulley with the Airbus part, which removes the compressor drive belt, and take no further action to fully or partially disable the air conditioning system, would any harm to the air conditioning system occ ur if the crew attempts to operate it? More importantly, would taking no further action create any increased hazard to the helicopter of any of its systems if the crew attemptsto operate it? An example, but not necessarily the only concern, would be ove rheating of any parts of the air conditioning system which could increase the possibility of fire. What I am thinking about here is the possibility of striking the deactivation requirement.

Please advise me at your earliest convenience so we can get this off to the Federal Register.

Respectfully,

Richard R. Thomas Aerospace Engineer (Mechanical Systems)
ANM

- 100D Denver ACO
Office

- 303.342.1085
Cell

- 720.961.3663

Air Comm Corporation acquired Meggitt (Addison), Inc., the former Keith
Products
as of May 22, 2013. Please update your records accordingly and visit http://www.aircommcorp.com/acquisition/announcement/for more information.

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