Can anybody ID these Plugs ?

Jon, I’ve sent you a PM containing a little more background. (Ignore the message title- technical failure on my behalf!)

Hi Dave

Thanks for that info, and thanks for taking the time to post.

Regards

Jon

Spark plug AP

Hi Jon,

According to AP113L-0500-1 SRR-2 are for Griffon Mks 57A and 58; please see here in Table 1 page 18 of the scan:

AP113L-0500-1 Aero Engine Sparking Plugs by dsgaviation

Regards

Dave