Have you checked performance #s?

[Lead Sled]

Really? You'll have to explain that to me.

The chart doesn't know what altitude your departure airport is, so if you tell it that you need to maintain 800 ft/nm to 10,000 feet and you are able to achieve that from 8500 to 10,000...then it stands to reason that you would be able to achieve it at less than 8500. Right?

I'm not questioning you, just wondering if I correctly understand the second-segment climb tables. (Lear takes 2nd segment all the way to 1500)

As for airport analysis, I agree 100%. I used it for years in part 121 and our department recently started using it part 91. I feel much more comfortable with their calculations then with me ham-fisting the charts to get runway limit or climb limit.

There are several reasons you cannot use AFM 2nd segment climb data in meeting TERP's criteria. First, all the one engine-out climb flight path data (1st, 2nd, and final segment climb charts) are only good to 1,500 above the runway (however, some manufacturers have gone beyond this point up to 3,000 to 5,000 feet) and CANNOT be used to the heights demanded of certain DP's such as is the case of KASE, 7,800 ft to 14,000 ft. 2nd segment climb data is generally only valid to 400 ft above runway, the point where 2nd segment ends. Second, the differences in climb terminology. Most 2nd segment climb gradient charts in AFM's give the available NET climb gradient so that when you apply this to the flight path charts or computer program you get a resulting NET flight path. TERP's climb requirements are based on actual performance, NOT an already an already reduced NET climb gradient. Then there's the consideration of 5 minute limitation on takeoff thrust. Many DP's require climb gradients to significantly high altitudes that would exceed the limitation on takeoff thrust, not to mention a shallowing climb gradient due to density altitude changes as you climb. Remember if you try to use 2nd segment climb, you'll only meet that climb gradient if you keep V2, takeoff flaps, and takeoff thrust and that climb gradient is generally valid only at 400 ft above the runway. Additionally, the charts assume essentially "wings level" flight (I don't remember the exact bank angle limit and my files are at home.) and many DPs involve turns that would exceed these bank angle limitations.

Aircraft "1-engine out" part 25 certification requirements only get us to 1500' AGL on takeoff, after which we immediately transition into the enroute all-engine TERPS climb. I guess that the original intent was that if we could safely get up to pattern altitude after losing an engine on takeoff we could bring the airplane back around for a landing. The enroute climb phase is based on all engine operation. If an engine is lost during that phase, it is an emergency, justifying the use of "alternate departure procedures" as provided by folks like APG or Jeppesen. (The alternate procedure for ASE isn't all that limiting, but it's a pretty demanding procedure - one best practiced a time or two in the sim.)

LS

 

[FurloughedAgain]

That makes perfect sense, thanks. So for those folks who do NOT have airport analysis and whose manufacturers do not provide all-engine climb data, how do they ensure they can comply with a TERPS climb gradient?

 

[Lead Sled]

That makes perfect sense, thanks. So for those folks who do NOT have airport analysis and whose manufacturers do not provide all-engine climb data, how do they ensure they can comply with a TERPS climb gradient?

Oh well, that's easy - all you have to do is go to your flight manual and find the "All Engine Operating Enroute Climb Chart". Oh wait, they don't provide us with that information in the flight manual. Hmmm, I guess you essentially have to determine the required rate of climb based upon your climb speed (a table is provided on the DP chart) and using all of your skill and experience as a pilot to guesstimate if you will be able to achieve the required climb rate. (I don't have to stretch too much - as I remember, the DP at ASE only required a climb rate of about 1600 fpm at 14,000' MSL. The stuff I've been flying will normally do about twice that. ) I guess what I'm trying to say is that you really need to have an alternate procedure available to you in the event of an engine loss - just like the 121 guys have.

LS

 

[ksu_aviator]

Can you say "Ultra-Nav"?

Nope.

1. They don't have my aircraft.

2. I'm not spending $1200 to get information that I can produce for free!

 

[SoundBarViolatr]

Terps

Actually, it was a p135 mission. But good points nontheless.

Actually, DP Climb Gradients are based upon "all engine" operations. Period, end of discussion. The takeoff performance charts in Part 25 transport category business jets only gets you to to 1500' AGL - in other words, pattern altitude. At that point you either come back around and land or you need to have the performance to do something else. This is a "corporate" forum so I'm assuming we're talking Part 91 operations here. Under part 91, you have no obligation to be able to achieve the required climb gradients after the loss of an engine; however, common sense and professionalism requires that you have a plan B just in case... This is where the "alternate" departure procedures come into play for 121, 135, and savy 91 operators. Oh well, this will probably start another firestorm. I recommend doing a search on Aspen. We've plowed this ground many times before.

LS

 

[TimsKeeper]

Ultranav

KSU pilot may be able to produce this information for free, however in my opinion Ultranav is worth every penny and thensome.

I remember back in the Hawker charter days Ultranav giving me information within a minute to make determinations that would of taken 15 minutes or more if I pulled the Manuals out. Now if you have to do this once or twice yeah Ultranav seems a bit extravagent. But when you are flying charter on a daily basis and some of it includes high-altitude Colorado airports with constantly changing winds and other conditions it makes a heck of a lot more sense.

It's an extremely useful tool and quite honestly 1200 bucks isn't that much when you're dealing with million dollar airplanes.

 

[Hugh Johnson]

I'd like to point out that airport analyses are company specific. You have to pay a vendor to develop the analysis for the specific airport and your airplane. I agree they're great, but the cost is prohibitive.

 

[Lead Sled]

KSU pilot may be able to produce this information for free, however in my opinion Ultranav is worth every penny and thensome.

I remember back in the Hawker charter days Ultranav giving me information within a minute to make determinations that would of taken 15 minutes or more if I pulled the Manuals out. Now if you have to do this once or twice yeah Ultranav seems a bit extravagent. But when you are flying charter on a daily basis and some of it includes high-altitude Colorado airports with constantly changing winds and other conditions it makes a heck of a lot more sense.

It's an extremely useful tool and quite honestly 1200 bucks isn't that much when you're dealing with million dollar airplanes.

I'd like to point out that airport analyses are company specific. You have to pay a vendor to develop the analysis for the specific airport and your airplane. I agree they're great, but the cost is prohibitive.

Ultra-Nav is great but it's only 1/2 of the correct solution. The real answer is to impliment both Ultra-Nav and airport analysis. Airport analysis will tell you how much you can carry and give you an alternate departure procedure if necessary and Ultra-Nav will quickly give you the numbers and speeds.

I'll have to disagree with Hugh Johnson, earlier this year I entered into an agreement with APG was for unlimited monthly usage for 1 airplane and the cost was less than $80 per month - hardly a cost prohibitive item.

LS

 

[corp_da20_guy]

Very well stated. Some guys are over cautious to the safe side, and some throw the book right out the window.

I wish I had a dollar for every King Air 200 guy I have heard say "The Military operates them at 14,000 lbs" or what ever the actual number is.

Yes they do, but they have a type, 2 crew, and have trained in it at that weight...... you?

Other guys are always looking for a reason not to fly.

I know of one guy who regularly departs an airport with the stick shaker going off.

That's interesting...didn't know there was a stick shaker in a King Air 200.

 

[LJ45]

Nope.

1. They don't have my aircraft.

2. I'm not spending $1200 to get information that I can produce for free!

I am glad you are not flying with me when you pull out the AFM, slide ruler and what ever else you need to get a number while your passengers and I wait. What do you do when conditions change at the last minute for example: it starts raining, they show up with extra passengers or runway change etc?

We use all available information, including Ultra-Nav.