Class notes
032 Performance
- Course
- Institution
All about performances that you need to know to pass the exam for the ATPL. Created by courses and Aviation exam question Bank
[Show more]
1 review
By: rmolenaar1999 • 1 year ago
Seller
Follow
kdmn
Reviews received
Content preview
ATPL (A)Review Worksheets
032 PERFORMANCES
BY KDMN
2020
,I/ CLASS OF PERFORMANCES – REGULATION
CLASS OF PERFORMANCES JET TURBOPROP PISTON
M > 5700kg or Nb of pax seats ≥ 9 Class A Class A Class C
M < 5700 kg and Nb of pax seats < 9 Class A Class B Class B
REGULATION CLASS A PERFORMANCES CLASS B PERFORMANCES
Certification CS 25 CS 23
Operation EASA AIR OPS Class A performance EASS AIR OPS Class B performance
II / DEFINITIONS – CALCULATIONS
01 STALL SPEED
➔ VSR= Reference stall speed, it must not be lower than VS1g, used for Certification Specification CS 25.
➔ VS0= Stall speed in landing configuration, used for Certification Specification CS 23.
➔ VS1=Stall speed in other configuration than landing configuration, used for Certification Specification
CS 23.
02 DENSITY ALTITUDE
It is the pressure altitude PA corrected with temperature. It is used to determine a/c performance.
03 WIND CALCULATION
• Wh, speed = Wspeed x cos (α):
Wh= headwind
➔ If cos(α)>0 -> Headwind
α
W = total wind WC= Crosswind ➔ If cos(α)<0 -> Tailwnid
• Wc, speed= Wspeed x sin (α)
• Ground Speed GS = True AirSpeed + Head/Tail wind = TAS + Wh,speed
04 PRESSURE ALTITUDE PA
All performance charts are given with pressure altitude, ie according to 1013Hpa. 1Hpa = 30ft.
PA = Altitude + (1013 – QNH)x30.
Ex1: Aerodrome Altitude = 2000 ft, QNH = 993. Δ(HPa) = 1013 – 993 = 10. Δ(ft)= 300ft -> PA = 2000 + 300 =
2300ft.
Ex2: Aerodrome Altitude = 2000ft QNH = 1023. Δ(HPa) = 1013 – 1023 = -10. Δ(ft)= -300ft -> PA = 2000 - 300
= 1700ft.
To know if you have to add/subtract Δ(HPa), draw a schema knowing that pressure decreases with altitude.
PA = 2300ft 2000ft
QNH = 993
1013
, 05 Δ(ISA) COMPUTATION
• ISA = at sea level : 15°C, 1013 HPa, -2°C/1000ft.
Ex: If Zp = 5000 ft, OAT = 10°C, what is ΔISA ?
➔ Under ISA condition : T°CISA at 5000 ft = 15 – 2x5 = 5°C, but here, T°C = 10 °C, it is warmer
-> ΔISA=+5°C.
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller kdmn. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $10.40. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
83637 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now