Airworthiness directives › 2021-26-01
AD 2021-26-01 Airworthiness Directives; Bell Textron Canada Limited Helicopters
Models named: 505. Read the applicability below — it usually turns on serial or part numbers too.
Applicability*9
This AD applies to Bell Textron Canada Limited Model 505 helicopters, serial numbers 65011 through 65234 inclusive, 65236 through 65348 inclusive, 65350, and 65352 through 65359 inclusive, with an S-TEC Corporation HeliSAS stability augmentation system and autopilot installed under Supplemental Type Certificate SR09758DS.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
Within 25 hours time-in-service or 30 days, whichever occurs first after the effective date of this AD, accomplish the following: (1) Using a flashlight, visually inspect the right forward T/R control cable assembly part number M207-20M489-041 in the area of the roller bracket assembly for signs of chafing. Move the T/R pedals through the full range of motion and inspect the T/R control cable for chafing. If there is any chafing, before further flight, remove cable assembly part number M207-20M489-041 from service. (2) Measure the clearance between the right forward T/R control cable and the roller bracket cut out as shown in Figure 1 of Bell Alert Service Bulletin 505-21-27, dated October 7, 2021. If the clearance is less than 0.3″ (7.6 mm), before further flight, adjust the height of the roller bracket assembly position until the clearance is a minimum of 0.3″ (7.6 mm).
Unsafe condition
This AD was prompted by a report of chafing of the right forward tail rotor (T/R) control cable caused by contact with an autopilot yaw servo bracket. The FAA is issuing this AD to detect and prevent chafing of the T/R control cable. The unsafe condition, if not addressed, could result in failure of the right forward T/R control cable, loss of T/R control, and subsequent loss of control of the helicopter.
Affected ADs
None.
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The directive text above is reproduced from the Federal Register, a work of the United States government and in the public domain. The separation into applicability, compliance and required actions is TrackAD's.*1