Service Bulletin #0002 - Reinforcement of the upper join between the centre and rear fuselages [Sling 4 & TSi]

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Service Bulletin #0002 - Reinforcement of the upper join between the centre and rear fuselages [Sling 4 & TSi]

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UPDATED DOCUMENTATION

SERVICE BULLETIN #0002
REINFORCEMENT OF THE UPPER JOINT BETWEEN THE CENTRE AND REAR FUSELAGES
RELEASE DATE: 11/02/2021

EFFECTIVE DATE: 11/02/2021

SUBJECT: Reinforcement of the upper join between the centre and rear fuselages

MODELS AFFECTED: Rev. 1 – Sling 4 and Sling 4 TSi (All from SN#001 to SN#060)
Rev. 2 – Sling 4 and Sling 4 TSi (All from SN#001 to SN#060 and
non-parachute versions from SN#060 to #306)

COMPLIANCE TIME: At the next MPI (Mandatory Periodic Inspection)

LABOUR TIME: Inspection only: 0.25 hours
Inspection & Repair: 2 hours

DESCRIPTION: To strengthen and prevent fatigue related failures to the upper centre and rear fuselage connection points.This bulletin, originally released on 14 August 2014, affected Sling 4 and Sling 4 TSi aircraft with serial numbers from #001 to #060. It has subsequently been updated to include non-parachute version aircraft with serial numbers #060 to #306.

Following implementation of supplementary non-destructive and destructive testing, Sling Aircraft has determined that it is necessary to make an amendment to the build standard of the Sling 4 aircraft, which takes effect on all Sling 4 / Sling 4 TSi aircraft with serial numbers SN#001 to SN#060, and non-parachute
versions of the aircraft with serial numbers from #060 to #306.

This Service Bulletin is required to be completed prior to or during the next MPI immediately after 11 February 2021. In addition, the change will affect all kit-built aircraft still under construction, prior to first flight. The change requires the installation of a number of additional aluminium blind rivets, of the kind used in the construction of the aircraft, to be fitted at specified spacing between the existing rivets attaching the upper rear fuselage skin to the rear canopy frame lip. In addition, certain existing 3.2mm rivets must be replaced with 4.0mm rivets.

If it is found that the skin on your aircraft does not match the original/fitted skins, or are unable to make the change due to pre-existing holes, please contact technical@slingaircraft.com, with a description of the issue with images.

https://mcusercontent.com/69a5281558c73 ... _Rev_2.pdf
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