# Calculation of temperature correction for altimeter

I try to calculate the correction of cold temperature for altimeter , i use for this the equation 24 of the Engineering Sciences Data Unit (ESDU) publication but it give me very high number . if i take for example the given conditions altitude of aircraft 1000 ft 0 ft for aerodrome altitude t0 288 K temperature deviation from the ISA = 259.9812 L0 = 0.001981 the result is 599777.4389 ft is too big , the expected result is 60 ft So where is mistakes ? EDIT : So i corrected the ISA dev according to what Ralph said but the result still incorrect i joint the step of calculation : the expected result is 60 ft • 259 degree temp dev from ISA is unreasonable by an order of magnitude. You may be mixing C and K units there. Please fix that & edit your question accordingly. – Ralph J Jan 24 at 3:09
• Infact 288degK at 0 ft altitude is = 15degC = ISA, so intended dev from ISA seems to be zero for purpose of the example question. – skipper44 Jan 24 at 4:34
• I agree, you are mixing temperature scales (K and C) and hence your incorrect result. – Juan Jimenez Jan 25 at 1:55

## 1 Answer

Finaly i have found the answer the error is on all book that published the equation there is the true equation • What is the source of the original screenshot (i.e. what published the wrong equation)? – Ralph J Jan 25 at 15:22
• Yes the original equation is given in PANS OPS Doc 8168 Chapter 4 section 3.4 – Namster Jan 25 at 15:48