---
title: "UAM.IDE.MVCA.145 Height-determination equipment — Part-IAM · Avioverse"
description: "The VCA shall, for flights over water, be equipped with a means to determine the height of the aircraft in relation to the water surface, capable of…"
url: "https://avioverse.aero/regulations/easa/air-ops/part-iam/subpart-d/uam-ide-mvca-145"
---

# UAM.IDE.MVCA.145 Height-determination equipment

ANNEX IX (Part-IAM) · Regulation (EU) No 965/2012 · EAR revision 27 Mar 2026

IR Implementing rule

## UAM.IDE.MVCA.145 Height-determination equipment

(a) The VCA shall, for flights over water, be equipped with a means to determine the height of the [aircraft](https://avioverse.aero/glossary/easa/aircraft) in relation to the water surface, capable of emitting an audio warning below a preset value and a visual warning at a height selectable by the pilot, when operating:

(1) at a distance from land corresponding to more than 3 minutes flying time at normal cruising speed;

(2) reserved;

(3) reserved;

(4) out of sight of the land.

IR · UAM.IDE.MVCA.145 — Regulation (EU) No 965/2012 · Regulation (EU) 2024/1111 · Air OPS Easy Access Rules · EAR revision 27 Mar 2026

AMC Acceptable means of compliance

## AMC1 UAM.IDE.MVCA.145 Height-determination equipment

RADIO ALTIMETER

A radio altimeter capable of emitting an audio warning below a preset height and a visual warning at a height selectable by the PIC may be used to meet the safety objective of point UAM.IDE.MVCA.145.

AMC · AMC1 UAM.IDE.MVCA.145 — Regulation (EU) No 965/2012 · ED Decision 2025/010/R · Air OPS Easy Access Rules · EAR revision 27 Mar 2026

AMC Acceptable means of compliance

## AMC2 UAM.IDE.MVCA.145 Height-determination equipment

AUDIO AND VISUAL WARNING

(a) The audio warning should be a voice warning. The voice warning alert should be distinguishable from other warnings and should contain a clear and concise voice message. The height at which the audio warning is triggered should be such as to provide adequate time for the PIC to take corrective action. The voice warning should be triggered only whilst descending through the preset datum height and be inhibited whilst ascending.

(b) The visual warning should require minimal interpretation by the PIC for both an instantaneous impression of absolute height and the rate of change of height.

AMC · AMC2 UAM.IDE.MVCA.145 — Regulation (EU) No 965/2012 · ED Decision 2025/010/R · Air OPS Easy Access Rules · EAR revision 27 Mar 2026

GM Guidance material

## GM1 UAM.IDE.MVCA.145 Height-determination equipment

TAWS

A VCA equipped with a TAWS is considered to meet the requirements of point UAM.IDE.MVCA.145.

GM · GM1 UAM.IDE.MVCA.145 — Regulation (EU) No 965/2012 · ED Decision 2025/010/R · Air OPS Easy Access Rules · EAR revision 27 Mar 2026

GM Guidance material

## GM2 UAM.IDE.MVCA.145 Height-determination equipment

It is recommended that an audio warning be triggered at a height in the range of 100–160 ft. The datum should not be adjustable in flight. Once triggered, the audio warning message should sound within 0.5 seconds.

GM · GM2 UAM.IDE.MVCA.145 — Regulation (EU) No 965/2012 · ED Decision 2025/010/R · Air OPS Easy Access Rules · EAR revision 27 Mar 2026

[All rules in SUBPART D — INSTRUMENTS, DATA AND EQUIPMENT](https://avioverse.aero/regulations/easa/air-ops/part-iam/subpart-d)

Consolidated from the EASA Easy Access Rules (revision 27 Mar 2026, extracted 13 Oct 2026) for convenience. Not the official publication — verify against the Official Journal of the European Union and the EASA publications before operational use.