Flight Instructors Training Procedures _revised AIC_x

1. AIM
LESSON 20
OTHER NON PRECISION APPROACHES
The aim of this exercise is to teach the student how to fly other types of non-precision approaches like
the VOR/DME, VOR/NDB approach and localiser only approaches.
DEFINITION
Other non-precision approaches may be defined as being approaches with the basic track guidance
being provided by the NDB and VOR but with extra information from other sources leading to improved
accuracy.
2. WHY IT IS BEING TAUGHT
This exercise is taught so that the student will be able to carry out non-precision approaches utilizing
additional aids which will usually result in a lower MDA.
3. WHAT THE INSTRUCTOR IS TO TEACH (Briefing of 1:30hr.)
i. Recap on the operation and limitations of DME.
ii. The operation and limitations of the localiser.
iii. Where to find localiser only minima.
iv. How to interpret a chart with these approach aids.
4. THE AIR EXERCISE
i.
ii.
HOLDING
THE VOR/DME APPROACH
The key to a successful approach is to
work out the slope of the descent path
required to cross the DME distances at
the required altitudes. This descent
part is normally around 3° or 300 ft. per
nm. and as a rough guide 5 x IAS (more
precisely this is 5 x the groundspeed)
will give the required ROD e.g. a final
approach speed of 90kts would require
a ROD of about 90 x 5 = 450 fpm.
Knowing approximately what power
setting will give this figure in the
approach configuration will reduce the
work for the pilot considerably.
*
i. The instructor can introduce DME by
requiring that the student fly a holding pattern
with DME limits e.g. hold on the 270 radial,
right turns between 10 and 15 DME or hold
on a QDM of 150 between 12 and 17 DME.
ii. The instructor should consider using this
exercise to revise EAT’s.
i. The instructor must insist on proper planning
and briefing for the approach. Particular
attention must be paid to DME distances
versus altitudes. During the first approach
the instructor could call the altitudes as the
various distances are passed and it is
required that the student do this on his own
the next time.
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