4.8 Means of Propulsion Evidencs and Control

4.8.1 Means of propulsion evidence

The requirement to record data on the use of any MoP may be fulfilled by any of the following methods:

a. The data is recorded by a MoP recorder, or

b. By direct observation from the ground that the MoP has stopped,provided that there is no means of restarting it, or

c. By a seal applied to the MoP in such a way that the generation of forward thrust by the MoP always results in breaking the seal.

d. For World Records, where a MoP recorder is required, it must be incorporated as part of the flight recorder.

4.8.2 MoP control methods

a. With the use of an MoP recorder:

The MoP recorder must be sealed and opened only by an OO, and mustnot be accessible to pilot or crew during flight, except where it is an IGC approved flight recorder operated in accordance with the IGC
approval.

b. Without the use of an MoP recorder:

(i) Before takeoff, the MoP may be sealed by an OO as in 4.8.1c (and the OO shall certify that the seal was intact after landing), or

(ii) The MoP may be rendered unusable by removing an essential part of the engine or the propeller (and the OO must certify that this was done), or

(iii) The MoP may have a mechanical lock applied to the retraction system that cannot be unlocked until after landing.

c. For World Records the MoP recorder must be of a type (see 4.8.1d.), which records the use of the MoP automatically, without any special action by the pilot and it must not be capable of being switched off during the flight, nor require a special type of mounting within the glider to enable it to operate.