Holdover Times Calculator

Name: Holdover Times Calculator
Author: Andrius Orlovas

De-icing app

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Details

Released: November 5, 2025
Updated: October 24, 2026
Version: 1.3
Compatibility: iOS 15.0+
Age Rating: 4+
Size: 11.93MB
Devices: iPhone, iPad, iPod
Data updated: 2 days ago
Languages: American English

Features

Developer

Andrius Orlovas

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About

The holdover time (HOT) calculator provides estimated time that deicing/anti-icing fluid will prevent the formation of frost or ice and the accumulation of snow on the critical surfaces of an aircraft. It help flight crews make decisions. Holdover Time begins at the start of the anti icing operation. If a two-step operation is used, then it begins at the start of the final (anti-icing) step. By definition therefore, holdover time will have effectively run out when frozen deposits start to form or accumulate on treated aircraft surfaces.

What's New in Holdover Times Calculator

1.3

October 24, 2026

This release updates the app for the 2026–2027 winter season: • Updated holdover time tables (version 26.1.0) with the latest FAA data, including new fluid types and revised snowfall intensity rules. • Improved offline mode: download the tables and FAA PDF document once, then use the calculator with no internet connection. • Fixed PDF document viewing, with page navigation and zoom now working on iPhone and iPad. • Countdown timer improvements: more accurate timing and reliable alerts, even when the app runs in the background. • Weather information now shows how fresh the data is, with a warning when observations are too old to rely on. • Calculator results now show exactly which FAA table and row they came from. • Real update checking: the app now verifies whether newer holdover tables are available.