Reference:
- 1.1 Honeywell/Aircelle Service Bulletin 78-30-007 & Bombardier Cover Service Bulletin 100-78-02 (HTF7000 Thrust Reverser – Door and Beam Assembly Corrosion Removal)
- 1.2 Honeywell/Aircelle Service Bulletin 78-30-006 Rev 1 & Bombardier Cover Service Bulletin 100-78-01 Rev 1 (Special Check – Thrust Reverser – Door and Beam Assembly Corrosion Inspection)
The reference 1.1 SB and revision 1 of the reference 1.2 SB together with the corresponding Honeywell/Aircelle vendor bulletins were released Dec. 15, 2011 and are currently available on Bombardier CIC website at http://www.cic.bombardier.com
Description:
The HTF7000 thrust reverser assembly corrosion removal SB (reference 1.1) provides a procedure to remove any corrosion present on the inner thrust reverser panels, perform an ultrasound inspection to confirm the remaining material thickness and apply a new coating for improved corrosion protection. The effectivity includes all aircraft up to A/C 20302 and has a compliance time of 48 months.
The repair procedure and application of new paint can take about 5 days (depending on manpower and work shifts) so operators should schedule the work at the earliest opportunity when the aircraft will be down for sufficient time to accomplish the procedure. The repair cost will be covered under a Honeywell special warranty program for engines both in and out of warranty provided that the work is performed at an approved facility prior to Dec. 31, 2015. This SB repair and new coating is considered the final fix for the T/R corrosion issue and once incorporated the repetitive T/R inspections outlined in the reference 1.2 SB will no longer be required. In the interim until the reference 1.1 repair SB is performed, the T/R corrosion inspection per the reference 1.2 inspection SB will need to be continued. In an effort to provide operators with some relief, the inspection interval has been revised to increase the repeat inspection from 400 to 800 flight hours for aircraft with 2400 or less hours. For aircraft with more than 2400 hours the repeat threshold remains unchanged at 400 hours (if corrosion was present at the previous inspection), but has been increased to 800 hours if no corrosion is present.
Please advise the service center well in advance of your scheduled visit to ensure that the required manpower and facilities are available. The level of paint work required necessitates that the repair be performed at a Honeywell Authorized Service Facility that has full paint shop capabilities.
