Thrust reverser service request for product support action (SRPSA) process

Effectivity: Challenger 300 and Challenger 350 aircraft

ATA 78

This article is designed to help better understand the process that goes into an SRPSA request for the Challenger 300 and Challenger 350 TR corrosion.

The SRPSA request is very important for each operator. Honeywell (HW) has established its corrosion warranty policy for the trust reverser based on the reporting of corrosion within the warranty period of the engine, which is 3,000 hours or five years. When reported during the warranty period, operators will be eligible for special pricing and parts replacement when and where applicable. By Bombardier recording initial corrosion, we can support our customers when making claims to HW. In addition, recording each event allows Bombardier to monitor the new coating and report effectiveness over a period of time to HW.

The processing of an SRPSA requires critical information such as;

• Part numbers

• Serial numbers

• Hours, cycles

• Dimensions of affected areas

• Pictures

• Clear request description

Each SRPSA goes through the following process;

1. SRPSA is submitted

2. Received and recorded by Bombardier, request to GKN is prepared

3. SRPSA submitted to GKN

4. GKN raise an internal technical variance

5. GKN then raises an Engineering Coordination Memo to Safran

6. Safran perform a stress analysis for each affected door

7. The disposition is based on the analysis performed and returned to GKN

8. GKN Engineering review the results and action accordingly

9. GKN send a Technical Variance to BA with the final disposition

10. BA Engineering evaluate the disposition to ensure compliance to all requirements prior to approval

11. BA then prepares an REO reflecting the GKN TV

12. The REO is then sent to the Customer/Operator/Maintenance Facility    

It’s important to know that the above process can be time consuming in regard to the Stress analysis by Safran. This is dependent upon the complexity and condition of the TR requiring the analysis

Also, please note that Honeywell has issued Service Bulletins (SB) to apply the new REACH compliant coating “Mapaero”, “100-78-05 & 350-78-002”. These SBs replace the previous SB that introduced the CA8000 coating 100-78-02. Mapaero coating offers a better protection against corrosion for the thrust reverser inner gas path. As part of the introduction, Honeywell and Safran compile a training program to help ensure a good understanding of the application process.

This training has been rolled out to several Bombardier service centres with a few remaining. Please note that as always, if any corrosion is found when incorporating any of the SBs, it must be reported via SRPSA. This as previously mentioned will allow Bombardier to support customers when requesting any special pricing from Honeywell. The SBs are available on the Bombardier Customer Portal.