Attention Citation 525A Operators – Aft Pressure Bulkhead Seal Cup Assembly Corrosion

Citation 525A
Citation 525A

During a recent routine Document 10 Inspection on a Citation 525A (CitationJet 2), technicians noticed a raised portion of B2 Sealant at the lower skin to bulkhead seam. Upon removal of the sealant, exfoliation corrosion was found.

This is a common area for corrosion to form as it is located at the lowest point in the aircraft, where moisture can accumulate. To compound the issue, the aft air conditioner evaporator is mounted directly over that location.

In order to remove and replace the seal cup, flight control cable tensions have to be broken and re-tensioned and rigged, and the Engine control cables removed. The process takes approximately 200 hours to remove and replace the assembly.

The Seal Cup Assembly is a machined aluminum plate that mounts on the lower center portion of the Aft Pressure Bulkhead. It acts as a structural reinforcement of the lower bulkhead skin as well as a “pass-through” for all of the flight control (elevator, rudder, and trim) and engine Teleflex control cables.

The aircraft that seem to be most affected by this are the CJ2 and CJ3 models. The severity of the aforementioned repair cannot be overstressed.

At this time, Textron Engineering allows no structural remedy other than complete removal and replacement.

West Star Aviation – ALN has performed five such repairs in the past two years. The aircraft affected are notably operated in coastal environments. The seal cup for both aircraft carries a similar part number and can come drilled or un-drilled upon request.

For more information on this issue or to schedule your next maintenance event,
please contact one of the Citation Specialists listed below:

Jerry Sheetz

Jerry Sheetz

Manager of Technical Sales (GJT
Office 970.683.4852

Sean Ertz

Sean Ertz

Technical Sales Manager (CHA)
Cell 423.681.8594

Jeff Messmer

Jeff Messmer

Technical Sales Manager
Cell 314.607.4069

Connor Mottice

Connor Mottice

Technician Sales Manager
Office 423.320.6156

Kevin Hand

Kevin Hand

Technical Sales Textron/Embraer (ALN)
Office 618.258.4779

Pat Welch

Pat Welch

Technical Sales Manager
Cell: 618.604.7008

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