WLM,
That would be correct as there is NO SB currently for the AUX Tank installation.
Keep in mind the difference between retrofit and manufacture. If the tank was installed by ECD it was probably done under a manufacturers design approval. If it is done by EC Malaysia then technically they are not the manufacturer.
There has been a concerted effort over the last few years by ECD to include SB's to cover retrofits and they have obviously been completed with the items of highest demand first.
For the AUX Tank SB EC135-28-017 -
Compliance:
By way of this Service Bulletin no work can be accomplished on the helicopter. It is for mere information
purposes about a possible retrofit only. The Service Bulletin may only be accomplished by ECD, an
ECD service station or a service station authorized by ECD.
Upon return of the reply form sheet (the last page of this Service Bulletin) ECD verifies the authorization
of the given service station and makes an offer.
After the order has been received, a helicopter–specific, simple Service Bulletin (cover SB) will be
created which only applies to the given service station and to the given S/N. This helicopter–specific
Service Bulletin is attributed with the same number as this Service Bulletin has plus an addition after
the issue sequence number (/01)
So the claims made by EC Malaysia are probably correct.
The above issue is even significant within ECD as there is a definite line on the ground beween manufacture and MRO.
I have raised this point that more support is needed in this area many times after going through extensive mods on a 135 when virtually none of the optional equipment installation was covered by SB. Wire Strike, Floats, SMD68, etc etc.
You would think that as there are now ~ 1000 of these aircraft in service this would be addressed by now. Sometimes I wonder about ECD's knowledge of it's own market.