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221 - ATPL - When flying in straight and level flight at FL 290 for some considerable time a small leak develops in the cabin which causes a slow depressurisation, this can be seen on the cabin rate of climb indicator which will indicate:

Question 221 - Operational Procedures - ATPL - Airline Transport Pilot license

A rate of climb
A rate of descent dependent upon the cabin differential pressure
Zero
A rate of descent of approximately 300 fpm

Training tests and timed exam simulations ATPL - Airline Transport Pilot license