NDB Holds

On 10/28/06 08:24, Sam Spade wrote:
Thomas Borchert wrote:
Alan,


my notes it
says to work out the timings use 75% of the head / tail wind factor.



Hmm. Why not 100 percent? The way I would do it is to figure out the
percentage the head/tail wind is of my IAS (TAS, if you want to get
precise). Then, I would correct 1 minute by that percentage. From your
notes, your supposed to take 75 percent of that percentage.

In reality, this takes way too much brain power away from controlling
the aircraft. Make intelligent guesses. E.g. your holding speed is 90
knots, your wind component is an estimated 10 knots, so you try a 10
seconds correction.


At 90 knots it all is just b.s. to try to placate some anal instructor
or check airperson. The holding pattern protected airspace is designed
for a jet aircraft.

Exactly. I think if you show the inspector that you:

1. consider the crosswind when taking a guess at your outbound and
inbound headings;
2. consider the head/tail wind when taking a guess at your initial
outbound timing;
3. make a reasonable adjustment to your second outbound timing after
seeing what your first inbound leg time was.

he will be impressed.

Note that in all three cases, all that will matter is that you make
the correction in the right direction; the *amount* of the correction
won't matter to them.

I know that during training, I would like to go around the holds over
and over, making minor corrections to try to get the time and heading
to work out perfectly - my instructor would just get bored and make
us move on ;-)


--
Mark Hansen, PP-ASEL, Instrument Airplane
Cal Aggie Flying Farmers
Sacramento, CA