gust factor

[AJL5236]

Had a discussion with a fellow pilot today about gust factors. Are you guys adding half of the gust factor or the full gust factor to the Vref speed? I have always been taught 1/2 the gust factor and the other has been taught the full gust factor. What is everyone esle doing"?... did a few searches on the .net and have found it mentioned both ways as all, what is the majority using? thanks

 

[stratman560]

We have always figured half the gust factor in addition to Vref on the C560. FYI.

 

[svcta]

Depends on your company's take on it....I've heard of some that add 1/2 the steady and all of the peak up to 20(if memory serves.....and this was on heavy's) and others that add 1/2 the gust.

 

[falconpilot]

Standard rule of thumb is usually

Half the steady wind + all the gust not to exceed 20kts

 

[Hugh Johnson]

Check your AFM. The F900 AFM is all the wind, half the gust with a limit of 20 KIAS.

 

[falconpilot]

Check your AFM. The F900 AFM is all the wind, half the gust with a limit of 20 KIAS.

Check YOUR afm... or page n-12 in the FSI check list...
"All wind gust + 1/2 steady wind (20kts maximum)"

All Falcons are this way...

 

[PUNISHER]

LearJet 25 AFM

Says add half the gust

 

[AJL5236]

should have included the type in the original post.. beechjet 400a

 

[PiratePilot]

We operate a BE-400A and the book states that "Final approach speed shall be no less than Vref +5 KIAS, nor greater than Vref + 15 KIAS." I apply 1/2 the steady state wind plus the entire gust not to exceed 15 KIAS.

 

[PUNISHER]

LearJet 25 AFM

I meant to say, add half the gust factor,
sorry it won't let me edit my post for some reason.

 

[Hugh Johnson]

Check YOUR afm... or page n-12 in the FSI check list...
"All wind gust + 1/2 steady wind (20kts maximum)"

All Falcons are this way...

So I'm dyslexic, tool.

 

[falconpilot]

So I'm dyslexic, tool.

Lol. I had to go back and look just to make sure. I hope I didn't offend you. If I did I apologize.

 

[EdAtTheAirport]

Double the ref speed, add half the number of pax, divide by which day of the trip you're on. You can't go wrong doing that.

 

[FL420]

Depends on what your approved AFM says. I believe most 121 operations in large aircraft use: VREF + ½ the steady state wind + all the gust(not to exceed VREF + 20 knots.)

The AIM says it differently when dealing with approach categories:
5-4-7. Instrument Approach Procedures
a. Aircraft approach category means a grouping of aircraft based on a speed of VREF, if specified, or if VREF not specified, 1.3 VSO at the maximum certificated landing weight. VREF, VSO, and the maximum certificated landing weight are those values as established for the aircraft by the certification authority of the country of registry. Helicopters are Category A aircraft. An aircraft must fit in only one category. Pilots are responsible for determining and briefing which category minimums will be used for each instrument approach. If a higher approach speed is used on final that places the aircraft in a higher approach category, the minimums for the higher category must be used. Approaches made with inoperative flaps, circling approaches at higher-than normal straight-in approach speeds, and approaches made in icing conditions for some types of airplanes are all examples of situations that can necessitate the use of a higher approach category. See the following category limits:
1. Category A: Speed less than 91 knots.
2. Category B: Speed 91 knots or more but less than 121 knots.
3. Category C: Speed 121 knots or more but less than 141 knots.
4. Category D: Speed 141 knots or more but less than 166 knots.
5. Category E: Speed 166 knots or more.

NOTE-
V[SIZE=-1]REF[/SIZE] is the reference landing approach speed, usually about 1.3 times V[SIZE=-1]SO[/SIZE] plus 50 percent of the wind gust speed in excess of the mean wind speed (See 14 CFR Section 23.73). V[SIZE=-1]SO[/SIZE] is the stalling speed or the minimum steady flight speed in the landing configuration at maximum weight (See 14 CFR Section 23.49).​

 

[doublepsych]

What???

Haven't you guys ever seen the benchmark training movie on this subject? It's called "10 Knots for Mom and the Kids".

First produced in about 1954, at the dawning of the jet age, this classic has apparently not made it's way to FSI...

 

[CallmeJB]

My company (121 CRJ) uses Ref + 1/2 the gust factor or Ref + 5, whichever is higher. No correction for steady state.

Just my $.02

 

[ag2pilot]

Maybe I'm stupid, but why would you add to ref for steady state wind? Do the manuals that show that give you shorter RW numbers for landing with a headwind? I hope not.

 

[SSDD]

One half the wind gust, up to 10 knots.

 

[rettofly]

Gust factor

So I'm dyslexic, tool.

Can't claim to be dyslexic if you can spell it.

 

[Hugh Johnson]

Can't claim to be dyslexic if you can spell it.

That hurt.