Approach · keep the go-around possible
Separate OEI approach climb from all-engine landing climb.
Which climb case limits landing mass?
CS-25 approach climb is an engine-out case: critical engine inoperative, remaining engines at the prescribed go-around thrust, gear retracted and approach configuration at the specified speed. Minimum gradients are 2.1%, 2.4% and 2.7% for two, three and four engines. The climb speed associated with the normal landing procedure is limited by the specified 1.4 VSR ceiling.
Two demonstrations, two configurations
CS-25 approach climb is an engine-out case: critical engine inoperative, remaining engines at the prescribed go-around thrust, gear retracted and approach configuration at the specified speed. Minimum gradients are 2.1%, 2.4% and 2.7% for two, three and four engines. The climb speed associated with the normal landing procedure is limited by the specified 1.4 VSR ceiling.
Landing climb is an all-engine case in landing configuration, gear extended, at the prescribed speed and thrust available after the defined thrust build-up interval (eight seconds from idle initiation). The minimum steady gradient is 3.2%. This demonstration cannot be substituted for OEI approach climb, and neither alone proves clearance of a published missed-approach path.
Read both mass limits
Higher temperature and pressure altitude normally reduce available thrust and lower the mass that meets the required gradient. The AFM can give separate approach-climb and landing-climb limited masses. Compare them with structural landing mass and field-length mass. A runway that is long enough to stop does not prove that a balked landing is supportable at that mass.
Published missed-approach gradients can exceed the certification minimum and may require a separate operational performance check. Use the actual engine status, configuration and applicable operator procedure. An ATC clearance does not guarantee obstacle clearance for a particular degraded aircraft.
Can you make the performance decision?
Four original questions. Work from the stated conditions and review the reasoning.