rl82 Aircraft flying steep approaches usually require more drag to stabilise the flight path, thus full landing configuration (and airbrake) may used from the start of descent.
Normally the same airspeeds apply. Some aircraft may fly fast to compensate for reduced flare performance, but this might be self limiting on a short runway – normally associated with ‘STOL’.
There will be differences in the ILS sensitivity, a greater beam cross-section with increasing approach path angle, but most airports adjust the transmitter beam-width characteristics. There may be similar problems with PAPI and approach lights.
The descent rate is approx twice the normal rate, thus there is less time for flight path correction and decision making. However, the options are much the same: fly the aircraft, assess the situation, and follow procedures.
Those aircraft certificated for ‘STOL’ have to demonstrate a stable approach requiring drag (as above), a sufficient margin of control – normally 2 deg above the approach glidepath, which also implies good control responsiveness factor (getting back to the GS quickly).
The aircraft must have good flare characteristics – the ability to quickly access lift to arrest the descent, preferably from a low flare height. This characteristic also confirms the ability to conduct a normal go-around, a certification demonstration which also includes an engine failure at the critical point.
Systems changes may include autopilot approach gain sensitivity and EGPWS alerting boundaries; these are normally selected by the crew.