Will PMDG give the rtow charts for 777? Or we will be using topcat for performance calculations. Auto vspeeds from FMC is not that realistic.

Will PMDG give the rtow charts for 777? Or we will be using topcat for performance calculations. Auto vspeeds from FMC is not that realistic.

From memory those are in the FPPM and AFM, both of which PMDG don't usually include in their manual. PMDG's manuals are usually licensed copies of the FCOM from Boeing. So anything you can find in an FCOM, will be included in the Operating Manuals (Vol1 & 2).

Boeing include detailed performance tables and charts in the Flight Planning and Performance Manual (FPPM). These include sufficient information to perform take-off performance analysis for a range of conditions. Historically, PMDG have not published this information.

 

However, the Flight Crew Operations Manual (FCOM) contains a subset of these tables and charts. The Boeing 777 FCOM contains tables for Flap 15 no derate take-off for both dry and wet runways. With the tables, you can determine field, climb, obstacle and tire speed weight limits for the ambient conditions. You can also work backwards to solve for the maximum temperature in which you can safety perform the take-off (this is your assumed temperature when applying the assumed temperature method). It is highly likely that PMDG will include a copy of the Boeing FCOM with the product.

 

If you have TOPCAT, I would recommend using that - there are 4 limit states that you must satisfy if calculating the take-off solution by hand...

 

 

If you have TOPCAT, I would recommend using that - there are 4 limit states that you must satisfy if calculating the take-off solution by hand...

 

no 777 in TOPCAT

That's true... serves me right for not checking.

 

Well at least Boeing are kind enough to supply the information in tables rather than a chart (nothing worse than wasting time plotting lines against interpolated curves).

PMDG have said that they can't supply perf data (for some reason), but they include it in the FMC instead, so we do get the data in some form.

 

Best regards,

Robin.

Isn't takeoff data, runway/taxi way specific?

 

 

Isn't takeoff data, runway/taxi way specific?

 

Yup, many other factors too : ambient air temp, length of runway, slope and condition, winds, baro, ac weight....

RTOW charts are often produced by the company flying the aircraft or a 3rd party. It takes into account the manuals produced by Boeing and also the particular runway in question.

PMDG have said that they can't supply perf data (for some reason), but they include it in the FMC instead, so we do get the data in some form.

 

Best regards,

Robin.

 

This isn't entirely true. As I mentioned, some of the performance tables are included as part of FCOM Volume 1 (Performance Dispatch and Performance In-flight chapters) and I just double checked - definitely included with the NGX.

RTOW charts are often produced by the company flying the aircraft or a 3rd party. It takes into account the manuals produced by Boeing and also the particular runway in question.

Yeah, we call them AAM's (airport analysis manuals). However there are charts/tables in the FPPM/FCOM and AFM for corrections for runway slopes, margins etc., so it is possible just to use those. It's just that the AAM's cut out the necessity of going through 5 different charts in 5 different manuals

Check out my guide here.

 

May help you (or give you a headache :lol: ).