interview question

[Uncle Leo]

I have some interview questions and one of them is "define the 60/1 rule"

what the heck is the 60/1 rule...I didnt see anything on the rules of thumb page that looked similar

Uncle Leo

 

[FurloughedAgain]

At 60 miles from the station 1 degree = 1 mile.

So if you're flying a DME arc 60 miles from the station 10 degrees = 10 miles...50 degrees = 50 miles etc.

You can use that basic formula to determine distance along an arc at any distance from the station.

30 miles from station, 1 degree = .5 miles... etc.

Good luck

 

[AMRCostUnit]

Here is a question that could be asked using 60/1:

"If you are going to do the 15DME arc, how many radials are you going lead the turn?"

Turn radius is roughly 1% of TAS so at 200TAS that is 2 miles.

At 15DME there are 4 radial per mile so the answer is 8 radial. It worked perfectly in the C-141.


How would I really do it? Pull up the approach in the FMS, make sure you select the transition with the arc, Execute and LNAV.

I believe I have flown ONE arc in 13 years of airline flying.

Unit

P.S. The 60/1 also works with the WX radar. If something is painting at 60 miles at 1 deg tilt down then it is 1 mile below you. At 1 deg up it is 1 mile above you and time to ask center for a left or right turn.

P.S.S. Do you have a credit card number I can use for all this instruction? I need all the income streams I can get!!

P.S.S.S. Can someone call me and at least pretend they are from Southwest?

 

[Captain Overs]

The FMS does a fine job of flying arcs and leading radials. I thought the 60/1 was for every 60 beers .....nevermind.

 

[walden]

The 60-to-1 rule is a technique for establishing predictable pitch changes and lead points for intercepting courses or arcs. Listed below are three good reasons for using this rule:
1) It allows you to compute pitch changes necessary when establishing an attitude during the control and performance concept of attitude instrument flying.
2)It reduces pilot workload and increases efficiency by requiring fewer changes and less guesswork.
3) It is an alternative to the TLAR (that looks about right) method of flying.
Background: circumference of a circle is 2 times pi times r. Therefore the circumference of a 60nm circle is (2) (3.14) (60) or 376.99nm.
Since there are 360 degrees in a circle: 376.99/360=1.0472nm per degree at 60nm.
Because 1nm = 6,076 feet we can therefore say: 1 degree = 6,000 feet at 60nm. This relationship is true in the horizontal plane (arc to radial/radial to arc) as well as the vertical plane (climbs and descents).

As you can see, everything the guys said above is true. This is just a little geeky background from the Air Force Instrument Flying Manual.
Hope it helped a little.

 

[flyhard]

I thought it was when you turn sixty and retire you will have 1 dollar in your pension.

 

[Green]

Walden 2)It reduces pilot workload and increases efficiency by requiring fewer changes and less guesswork.
I don't know about reducing workload; just reading your post was a lot of work. Call me lazy but I think the TLAR (that looks about right) method works just fine. If I'm going to actually hand fly the thing with raw data I use the highly technical method of varying my bank angle based on the rate at which the needle is moving.

 

[walden]

Green,
It is tedious at first! I'm a math dunce. But the more you use it, the easier it is to use. TLAR works fine too, especially with tons of experience in a certain type. I have to teach this stuff every day because my students have no experience and a very shallow clue bag. Most of the calculations are done during the prebrief. Groundspeed zero frees up a lot of brain cells.
Oh, by the way, you're lazy. Hey, you told me to

 

[caseyd]

The FMS does a fine job of flying arcs and leading radials. I thought the 60/1 was for every 60 beers .....nevermind.

What he said.......