Hi MM,
You don't mention what type of aircraft you fly but assuming it's a commercial aircraft in EASA land have a look at AMC 145.A.30
It states the following:
AMC145.A.30(j)(4)
Personnel requirements
For the issue of a limited certification authorisation:
(a) the commander should hold either an air transport pilots license (ATPL), or a commercial pilots license (CPL).
(b) The flight engineer should hold either an ATPL, CPL or a national flight engineer licence acceptable to the competent authority on the aircraft type.
In addition the limited certification authorisation is subject to the maintenance organisation exposition containing procedures to address the personnel requirements of 145.A.30(e) and associated AMC and guidance material. The procedures should be accepted by the competent authority and should include as a minimum:
(a) Completion of adequate maintenance airworthiness regulation training.
(b) Completion of adequate task training for the specific task on the aircraft. The task training should be of sufficient duration to ensure that the individual has a thorough understanding of the task to be completed and will involve training in the use of associated maintenance data.
(c) Completion of the procedural training as specified in Part-145.
2.(i) Typical tasks that may be certified and/or carried out by the commander holding an ATPL or CPL are minor maintenance or simple checks included in the following list:
(a) Replacement of internal lights, filaments and flash tubes.
(b) Closing of cowlings and refitment of quick access inspection panels.
(c) Role changes e.g. stretcher fit, dual controls, FLIR, doors, photographic equipment etc.
(d) Inspection for and removal of de-icing/anti-icing fluid residues, including removal/closure of panels, cowls or covers that are easily accessible but not requiring the use of special tools.
(e) Any check/replacement involving simple techniques consistent with this AMC and as agreed by the competent authority.