I found the FCTM wording in Chapter 1 General:
Conditions Affecting Maneuver Margins
For a fixed weight and altitude, maneuver margin to stick shaker increases when airspeed increases. Other factors may or may not affect maneuver margin:
- Gross weight: generally maneuver margin decreases as gross weight increases
- Altitude: generally maneuver margin decreases with increasing altitude for a fixed airspeed
- Temperature: the effect of a temperature change on maneuver margin is negligible
- Landing gear: a small decrease in maneuver margin may occur when the landing gear is extended. This loss is equivalent to 2 knots of airspeed or less
- Speedbrakes: generally maneuver margin decreases when speedbrakes are extended
- Engine failure during flap rectraction: a small decrease in maneuver margin occurs due to the reduced lift experienced with the loss of thrust. The loss is equivalent to 4 knots of airspeed or less
Notice the 4 knot loss of
maneuver margin is only for engine failure
during flap retraction.