Federal Register - July 7, 2021
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Source: Federal Register
35694
Federal Register / Vol. 86, No. 127 / Wednesday, July 7, 2021 / Proposed Rules
e Unsafe Condition
g Required Actions 1 Within 30 days after the effective date of this AD, revise the existing Rotorcraft Flight Manual for your helicopter as follows:
i In Section 2, Normal Procedures, under 24. INTERIOR AND PRESTART CHECK, add the following as item 25: 25. Depress the cyclic force TRIM REL button and collective FORCE REL button 4-axis only to center actuators and extinguish any active out of detent indications.
ii In Section 2, Normal Procedures, under 25. ENGINE START and under 28.
TAKEOFF, add the following above item 1:
CAUTION: WHEN MANIPULATING
This AD was prompted by three reports of unexpected forces or uncommanded inputs to the directional yaw control system. The FAA is issuing this AD to prevent yaw trim runaway. The unsafe condition, if not addressed, could result in loss of control of the helicopter.
f Compliance Comply with this AD within the compliance times specified, unless already done.
FLIGHT CONTROLS WITH FORCE TRIM
SELECTED ON, DO NOT RELEASE
AFFECTED FLIGHT CONTROL UNTIL THE
OUT OF DETENT INDICATION
EXTINGUISHES. THE FLIGHT CONTROLS
MAY BE RESET BY DEPRESSING THE
CYCLIC FORCE TRIM REL BUTTON AND
COLLECTIVE FORCE REL BUTTON 4AXIS
ONLY UNTIL THE OUT OF DETENT
INDICATION EXTINGUISHES.
iii In Section 3, Emergency and Malfunction Procedures, under 39.
AUTOMATIC FLIGHT CONTROL SYSTEM, add the information in Figure 1 to paragraph g1iii of this AD as item 39D:
3-9-D. TRIM RUNAWAY
INDICATIONS:
Flight controls - Uncommanded movement.
Flight control forces - High in axis of uncommanded movement, normal in other axes.
Out of detent indication for affected axis PROCEDURE:
1. Cyclic force TRIM REL and/or collective FORCE REL button 4-axis only-Depress until the out of detent indication extinguishes.
2. Flight controls - Do not release flight control if out of detent indication is present.
3. Force TRIM switch-OFF; check TRM OFF illuminates on PFD.
4. IfIMC, land as soon as practical. IfVMC, continue flight in SCAS.
iv In Section 4, Performance, under 42.
POWER ASSURANCE CHECK, add the following above the instructions for performing a power assurance check:
CAUTION: WHEN MANIPULATING
FLIGHT CONTROLS WITH FORCE TRIM
SELECTED ON, DO NOT RELEASE
AFFECTED FLIGHT CONTROL UNTIL THE
OUT OF DETENT INDICATION
EXTINGUISHES. THE FLIGHT CONTROLS
MAY BE RESET BY DEPRESSING THE
CYCLIC FORCE TRIM REL BUTTON AND
COLLECTIVE FORCE REL BUTTON 4AXIS
ONLY UNTIL THE OUT OF DETENT
INDICATION EXTINGUISHES.
2 Using a document with information identical to the information in paragraph g1 of this AD is acceptable for compliance
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with the actions required by paragraph g1
of this AD.
3 The actions required by paragraphs g1 and 2 of this AD may be performed by the owner/operator pilot holding at least a private pilot certificate and must be entered into the aircraft records showing compliance with this AD in accordance with 43.9a1
through 4 and 91.417a2v. The record must be maintained as required by 91.417, 121.380, or 135.439.
h Alternative Methods of Compliance AMOCs 1 The Manager, International Validation Branch, FAA, has the authority to approve AMOCs for this AD, if requested using the procedures found in 14 CFR 39.19. In
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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 International Validation Branch, send it to the attention of the person identified in paragraph i1 of this AD.
Information may be emailed to: 9-AVS-AIR730-AMOC@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.
i Related Information 1 For more information about this AD, contact Mitch Soth, Flight Test Engineer,
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Figure 1 to paragraph gliii
