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Federal Register / Vol. 86, No. 183 / Friday, September 24, 2021 / Proposed Rules Replacing the oil cooler blower assembly would take about 3 workhours and parts would cost about $2,720
for an estimated cost of $2,975 per replacement.
Aligning each bolt hole and retorqueing the drive pulley would take about 0.5 work-hours for an estimated cost of $43 per helicopter.
Authority for This Rulemaking Title 49 of the United States Code specifies the FAAs authority to issue rules on aviation safety. Subtitle I, section 106, describes the authority of the FAA Administrator. Subtitle VII:
Aviation Programs, describes in more detail the scope of the Agencys authority.
The FAA is issuing this rulemaking under the authority described in Subtitle VII, Part A, Subpart III, Section 44701: General requirements. Under that section, Congress charges the FAA
with promoting safe flight of civil aircraft in air commerce by prescribing regulations for practices, methods, and procedures the Administrator finds necessary for safety in air commerce.
This regulation is within the scope of that authority because it addresses an unsafe condition that is likely to exist or develop on products identified in this rulemaking action.
Regulatory Findings The FAA determined that this proposed AD would not have federalism implications under Executive Order 13132. This proposed AD would not have a substantial direct effect on the States, on the relationship between the national Government and the States, or on the distribution of power and responsibilities among the various levels of government.
For the reasons discussed, I certify this proposed regulation:
1. Is not a significant regulatory action under Executive Order 12866, 2. Would not affect intrastate aviation in Alaska, and 3. Would not have a significant economic impact, positive or negative, on a substantial number of small entities under the criteria of the Regulatory Flexibility Act.

PART 39AIRWORTHINESS
DIRECTIVES
1. The authority citation for part 39
continues to read as follows:

Authority: 49 U.S.C. 106g, 40113, 44701.
39.13

Amended
2. The FAA amends 39.13 by adding the following new airworthiness directive:

Bell Textron Canada Limited: Docket No.
FAA20210830; Project Identifier AD
202000257R.
a Comments Due Date The FAA must receive comments on this airworthiness directive AD by November 8, 2021.
b Affected ADs None.
c Applicability This AD applies to the Bell Textron Canada Limited helicopters identified in paragraphs c1 and 2 of this AD.
1 Model 206L1 and Model 206L3
helicopters, certificated in any category, with Bell Model 206L1/L3 Service Instruction for Increased Gross Weight Upgrade Kit BHT
206SI2052, Revision 1, dated October 14, 2010 BHT206SI2052, installed and that are equipped with one of the following Air Comm Corporation Air Comm Supplemental Type Certificate STC
SH2750NM air conditioning systems part number P/N 206EC2041, 206EC2042, 206EC2081, 206EC2082, 206EC2101, 206EC2102, 206EC2103, 206EC2123, or 206EC2124.
Note 1 to paragraph c1 of this AD:
Helicopters with a 206L1+ designation are Model 206L1 helicopters and helicopters with a 206L3+ designation are Model 206L
3 helicopters.
2 Model 206 L4 helicopters, certificated in any category, and that are equipped with one of the following Air Comm STC
SH2750NM air conditioning systems P/N
206EC2041, 206EC2042, 206EC2081, 206EC2082, 206EC2101, 206EC2102, 206EC2103, 206EC2123, or 206EC212
4.
d Subject Joint Aircraft Service Component JASC
Code: 6510, Tail Rotor Drive Shaft.

The Proposed Amendment
e Unsafe Condition This AD was prompted by reports of deformation or fretting of the spline teeth on the air conditioning system and on the oil cooler blower shaft. The FAA is issuing this AD to detect deformation and fretting. The unsafe condition, if not addressed, could result in a failure of the oil cooler blower shaft, which could lead to loss of tail rotor authority and subsequent loss of helicopter control.

Accordingly, under the authority delegated to me by the Administrator, the FAA proposes to amend 14 CFR part 39 as follows:

f Compliance Comply with this AD within the compliance times specified, unless already done.

List of Subjects in 14 CFR Part 39
Air transportation, Aircraft, Aviation safety, Incorporation by reference, Safety.

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g Required Actions Within 300 hours time-in-service TIS
after the effective date of this AD, and thereafter at intervals not to exceed 300 hours TIS:
1 Gain access to the drive ring spline teeth and the mating area spline teeth on the oil cooler blower shaft by removing the tail rotor drive systems forward short shaft and spline adaptor, and the air conditioner systems drive ring. Refer to Figure 1 of ACC
Air Comm Corporation Service Bulletin SB
206EC091119, Rev B, dated May 26, 2021
for a depiction of each components location.
2 Visually inspect the drive ring spline teeth and the mating area spline teeth on the oil cooler blower shaft for deformation and fretting.
i If there is deformation or fretting on the drive ring spline teeth, before further flight, remove the drive ring from service and replace it with an airworthy part.
ii If there is deformation or fretting on the mating area spline teeth of the oil cooler blower shaft, before further flight, remove the oil cooler blower assembly from service and replace with an airworthy part.
3 Reinstall the drive ring, spline adapter, and the forward short shaft. If the compressor drive pulley was or removed, torque the drive pulley to 200300 in-lbs, increasing torque in this range to align the four threaded holes with the through holes in the drive ring. Do not back-off torque to align the bolt holes.
h Special Flight Permits Special flight permits are prohibited.
i Alternative Methods of Compliance AMOCs 1 The Manager, Denver ACO, FAA, has the authority to approve AMOCs for this AD, if requested using the procedures found in 14
CFR 39.19. In accordance with 14 CFR 39.19, send your request to your principal inspector or local Flight Standards District Office, as appropriate. If sending information directly to the manager of the Denver ACO, send it to the attention of the person identified in paragraph j1 of this AD. Information may be emailed to: 9-Denver-Aircraft-Cert@
faa.gov.
2 Before using any approved AMOC, notify your appropriate principal inspector, or lacking a principal inspector, the manager of the local flight standards district office/
certificate holding district office.
j Related Information 1 For more information about this AD, contact Matthew Bryant, Aerospace Engineer, Denver ACO Branch, FAA, 26805 East 68th Avenue, Denver, CO 80249; telephone 303
3421092; email 9-Denver-Aircraft-Cert@
faa.gov.
2 For service information identified in this AD, contact Air Comm Corporation, 1575
W 124th Ave. 210, Westminster, CO 80234;
telephone: 303 4404075; email cposvic@
aircommcorp.com. You may view the referenced service information at the FAA, Office of the Regional Counsel, Southwest Region, 10101 Hillwood Pkwy., Room 6N
321, Fort Worth, TX 76177. For information on the availability of this material at the FAA, call 817 2225110.

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