Airworthiness directives › 2020-16-15
AD 2020-16-15 Airworthiness Directives; Viking Air Limited Airplanes
Models named: DHC-2 Mk. I, DHC-2 Mk. III. Read the applicability below — it usually turns on serial or part numbers too.
Applicability*9
This AD applies to the following Viking Air Limited airplanes, certificated in any category: (1) Model DHC-2 Mk. I airplanes altered by Supplemental Type Certificate (STC) SA92-63 or SA00299NY with a float strut wire pull fitting part number (P/N) VALTBS1245-1, P/N VALTBS1245-2, P/N VALTBS1244-1, P/N VALTBS1244-3, or P/N VALTBS1244-4; and (2) Model DHC-2 Mk. III airplanes altered by STC SA91-18 or SA945NE with a float strut wire pull fitting P/N VALTBS1245-1, P/N VALTBS1245-2, P/N VALTBS1244-1, P/N VALTBS1244-3, or P/N VALTBS1244-4.
Compliance
Unless already done, do the following actions. (1) Within 90 days after August 17, 2020 (the effective date of this AD): (i) Replace each forward wire pull fitting P/N VALTBS1245-1 and P/N VALTBS1245-2 with P/N VALTBS1245-3 Left Hand (LH) or P/N VALTBS1245-4 Right Hand (RH) by following the Accomplishment Instructions, paragraphs A.1. through A.8., of Viking DHC-2 Beaver Service Bulletin No. V2/003, Revision NC, dated November 28, 2012 (Viking SB No. V2/003); or Viking DHC-2T Beaver Service Bulletin No. V2/002, Revision A, dated September 12, 2011 (Viking SB No. V2/002, Revision A), as applicable to your model airplane. (ii) Within 110 hours time-in-service (TIS) after the replacement of the forward wire pull fittings and thereafter at intervals not to exceed 110 hours TIS, visually inspect each forward wire pull fitting for corrosion and cracks. If there is any corrosion or a crack, before further flight, replace the fitting with fitting P/N VALTBS1245-3 (LH) or P/N VALTBS1245-4 (RH). (2) Within 180 days after August 17, 2020 (the effective date of this AD): (i) Replace each aft wire pull fitting P/N VALTBS1244-1 with P/N VALTBS1244-3 (LH) or P/N VALTBS1244-4 (RH) by following the Accomplishment Instructions, paragraphs B.1. through B.8., of Viking SB No. V2/003 or Viking SB No. V2/002, Revision A, as applicable to your model airplane. (ii) Within 110 hours TIS after the replacement of the aft wire pull fittings and thereafter at intervals not to exceed 110 hours TIS, visually inspect each aft wire pull fitting for corrosion and cracks. If there is any corrosion or a crack, before further flight, replace the fitting with fitting P/N VALTBS1244-3 (LH) or P/N VALTBS1244-4 (RH).
Required actions
The Manager, Small Airplane Standards Branch, FAA, has the authority to approve AMOCs for this AD, if requested using the procedures found in 14 CFR 39.19. Send information to ATTN: Aziz Ahmed, Aerospace Engineer, FAA, New York ACO Branch, 1600 Stewart Avenue, Suite 410, Westbury, New York 11590; telephone: (516) 287-7329; fax: (516) 794-5531; email:. Before using any approved AMOC on any airplane to which the AMOC applies, notify your appropriate principal inspector (PI) in the FAA Flight Standards District Office (FSDO), or lacking a PI, your local FSDO.
Unsafe condition
This AD was prompted by mandatory continuing airworthiness information (MCAI) originated by an aviation authority of another country to identify and correct an unsafe condition on an aviation product. The MCAI describes the unsafe condition as cracks reported on the forward and aft float strut wire pull fittings. The FAA is issuing this AD to prevent failure of the wire pull fittings, which could reduce the strength of the float undercarriage below the required structural capability, resulting in a failure of the undercarriage causing the airplane to tip over and submerge.
Affected ADs
None.
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