Cold temperatures negatively affect altimeter accuracy, causing them to indicate a higher altitude than actual, which reduces obstacle protection on instrument procedures. While cold, dense air ...

Norwegian investigators have determined that weak altimeter procedures resulted in a Wideroe De Havilland Dash 8-300 crew’s forgetting to set and check the correct QNH pressure during an approach to ...

But with a QNH setting for the altimeter the aircraft would have been barely 120m above the airfield elevation. While still 15km from Tynda’s runway, the An-24 collided with trees at an altitude of ...