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Federal Register / Vol. 86, No. 49 / Tuesday, March 16, 2021 / Rules and Regulations AD Requirements
on other helicopters of the same type design.
Related Service Information Under 1
CFR Part 51
The FAA reviewed Bell Alert Service Bulletin 5052120, Revision B, dated March 3, 2021 ASB 5052120 Rev B.
ASB 5052120 Rev B provides instructions for an initial and recurring FPIs for cracks in the pilot collective stick and grip assembly part number M20720M478041/043/047 on Bell Model 505 helicopters, serial numbers 65011 and subsequent. ASB 5052120
Rev B also specifies inserting TRs into the RFMs that prohibit single pilot operations from the right crew seat until further notice. Finally, ASB 5052120
Rev B specifies that if the right crew seat pilot collective stick assembly was previously confirmed serviceable following an FPI in accordance with Bell Alert Service Bulletin 5052120, Revision A, dated February 26, 2021
ASB 5052120 Rev A, which is not incorporated by reference in this AD, then the 25 flight hour recurring FPI of the right crew seat pilot collective stick assembly is no longer required provided that the helicopter is only operated single pilot in command PIC from the left crew seat. If conducting dual pilot operations, ASB 5052120 Rev B
specifies a 25 flight hour recurring FPI
of the right crew seat pilot collective stick assembly.
The FAA also reviewed Bell 505 RFM
TR for Pilot Collective ASB 50521
20, BHT505FM1, Temporary Revision TR6 BHT505FM1, TR
6 and Bell 505 RFM TR for Pilot Collective ASB 5052120, BHT505
FM2, Temporary Revision TR1, each dated March 3, 2021. These TRs specify changes to Section 1 of the RFM
Limitations Section that the minimum flight crew consists of one pilot that shall operate from the left crew seat and that dual operation is approved provide that the PIC occupies the left crew seat.
BHT505FM1, TR6 also prohibits use of SPLITCOM mode.
This service information is reasonably available because the interested parties have access to it through their normal course of business or by the means identified in the ADDRESSES section.

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Other Related Service Information The FAA reviewed Bell ASB 50521
20, dated February 20, 2021 ASB 505
2120 and ASB 5052120 Rev A. ASB
5052120 specifies a one-time inspection for cracks of the pilot collective stick and grip assembly. ASB
5052120 Rev A removes the visual inspection and adds a repetitive FPI.

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This AD requires, before further flight, revising Section 1, the Limitations section of the existing RFM for your helicopter to prohibit single pilot operations from the right crew seat, require the pilot in command to occupy the left crew seat for dual pilot operations, and depending on configuration, prohibiting the use of SPLITCOM mode. This AD also requires, before further flight and thereafter at intervals not to exceed 25
hours TIS, removing the pilot collective stick from the jackshaft assembly, cleaning it as specified in ASB 50521
20 Rev B, and performing an FPI for a crack as specified in ASB 5052120
Rev B. Removing from service any cracked pilot collective stick is required before further flight. In addition, this AD requires, within 10 days after the discovery of any crack, reporting certain information to Bell. This AD also prohibits installing any pilot collective stick and grip assembly on any helicopter unless it has successfully passed the FPI inspection requirements of this AD. Lastly, this AD prohibits relief under any Master Minimum Equipment List or Minimum Equipment List for the Audio Panel when the aircraft is operated with a single pilot.
Differences Between This AD and the Transport Canada This AD prohibits relief under any Master Minimum Equipment List or Minimum Equipment List for the Audio Panel when the aircraft is operated with a single pilot, whereas Canadian AD
CF202105R2 does not. Canadian AD
CF202105R2 requires the repetitive FPI if the aircraft is not flown solely from the left crew seat whereas this AD
requires FPI regardless.
Interim Action The FAA considers this AD to be an interim action and acknowledges that the requirement to revise the existing RFM for your helicopter to require the pilot in command to occupy the left crew seat, and, depending on configuration, prohibit the use of SPLITCOM mode may impact seatdependent training for some helicopters operating under Part 135. However, the unsafe condition requires the FAA to mandate these requirements for continued operational safety. The inspection reports that are required by this AD will enable the FAA to obtain better insight into the cause of the cracking, and eventually develop final action to address the unsafe condition.
Once final action has been identified,
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the FAA might consider further rulemaking.
Justification for Immediate Adoption and Determination of the Effective Date Section 553b3B of the Administrative Procedure Act APA 5
U.S.C. 551 et seq. authorizes agencies to dispense with notice and comment procedures for rules when the agency, for good cause, finds that those procedures are impracticable, unnecessary, or contrary to the public interest. Under this section, an agency, upon finding good cause, may issue a final rule without providing notice and seeking comment prior to issuance.
Further, section 553d of the APA
authorizes agencies to make rules effective in less than thirty days, upon a finding of good cause.
An unsafe condition exists that requires the immediate adoption of this AD without providing an opportunity for public comments prior to adoption.
The FAA has found that the risk to the flying public justifies foregoing notice and comment prior to adoption of this rule because certain requirements must be accomplished before further flight.
Accordingly, notice and opportunity for prior public comment are impracticable and contrary to the public interest pursuant to 5 U.S.C. 553b3B.
In addition, the FAA finds that good cause exists pursuant to 5 U.S.C. 553d for making this amendment effective in less than 30 days, for the same reasons the FAA found good cause to forego notice and comment.
Comments Invited The FAA invites you to send any written data, views, or arguments about this final rule. Send your comments to an address listed under ADDRESSES.
Include Docket No. FAA20210144;
Project Identifier MCAI202100255R
at the beginning of your comments. The most helpful comments reference a specific portion of the final rule, explain the reason for any recommended change, and include supporting data.
The FAA will consider all comments received by the closing date and may amend this final rule because of those comments.
Except for Confidential Business Information CBI as described in the following paragraph, and other information as described in 14 CFR
11.35, the FAA will post all comments received, without change, to https
www.regulations.gov, including any personal information you provide. The agency will also post a report summarizing each substantive verbal contact received about this final rule.

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