Suspected Unapproved Parts Details
Evidence indicates that personnel may not have assembled the induction air boxes per methods, techniques, and practices documented in Advisory Circular 43.13, even though the air boxes meet fit, form, function, dimensional measurements, and material thickness requirements for compliance with Airworthiness Directive (AD) 85-10-02. During the repairs of each air box, the material thickness was increased to 0.040” as called out in AD 85-10-02, but this one fact alone is not the terminating action for compliance with the AD.
An inspection of air box serial number PAM 180 revealed the following anomalies:
1. Cracks emanating from drilled holes.
2. Lack of deburring skins.
3. Tool marks in radius.
4. Improper rivet lengths.
5. Improper riveting and non-standard bucktails.
6. Alternate air door gasket material rubbing on the inside radius of the housing.