CAP 670 Air Traffic Services Safety Requirements 2(71)

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4.5  Standby Power
Standby power supplies shall be provided commensurate with the service being supported (1823).
4.6  Use of DME as a Ranging Element with Precision Approach. NOTE: This includes the use of DME/N with MLS supporting a straight in approach.
4.6.1  The DME shall be sited to keep the triangulation error at the point at which the distance is required to a minimum (1825).
4.6.2  Requirements for identification when associated with an ILS are detailed in ILS 06 (1826).
4.7  Status Information
4.7.1  Flight Information Service Officers and/or Air Traffic Controllers directly responsible for approach, landing and take-off at the aerodrome(s) with which they are concerned shall be provided with information on the operational status of radio navigation services, on a timely basis, consistent with the use of the service(s) involved (2314).
4.7.2  Where status information is reliant upon a visual status indicator, then an audible alarm should be provided which indicates that the visual indicator has changed state (2315).
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NAV 06  Distance Measuring Equipment (DME) Flight Inspection Types and Requirements
Part 1 Preliminary Material
1 Introduction
It is a requirement that all DME systems and associated Instrument Flight Procedures are checked by flight inspection at prescribed intervals.
2 Scope
This document defines the following:
.
Parameters to be assessed;

.
Measurement methods;

.
Flight inspection tolerance limits;

.
Flight inspection interval.

Part 2 Requirements
3  Safety Objective 
To ensure that the DME provides an accurate and uncorrupted source of range information within the Designated Operational Coverage. 
4  Parameters To Be Assessed 
The following parameters shall be assessed for the prescribed transponders and be within limits: 
4.1 4.1.1  NOTE: Commissioning checks are required on change of equipment or change of Instrument Flight Procedure (IFP). Accuracy The table below provides the accuracy requirements for the various uses of the DME. 

Procedure Supported by the DME  Where and how measurement is made  Interval / Tolerance  Transponder 
DME associated with precision approach  4NM – 1NM from threshold on approach  Comm ± 0.03 NM (2179) Routine ± 0.1 NM (2180)  Comm both Routine one TXP 
DME associated with Instrument Approach Procedures (IAP) that are not precision approaches  4NM – 1NM from threshold on approach  Comm / Routine ± 0.1 NM (2181)  Comm both Routine one TXP 
IFP  Spot check at ranges promulgated on the procedure  Comm ± 0.1 NM (2182)  One TXP 
Missed Approach Procedure  Spot check at ranges promulgated on the procedure  Comm / Routine ± 0.1 NM (2183)  One TXP 
Direct Arrivals  Spot check at ranges promulgated on the procedure The orbit as required for DME general below, may be carried out at the appropriate radius  Comm ± 0.1 NM (2184)  One TXP 
Hold  Spot check at ranges promulgated on the procedure  Comm ± 0.1 NM (2185)  One TXP 
DME general  An orbit at a radius of 5 NM or greater at an elevation of 2o from the DME site or above MSA.  Comm ± 0.1 NM (2186)  A complete orbit on one transponder. Followed by a minimum 20o overlap on the second transponder. 
En-Route  During radials flown on any associated facility  Comm / Routine ± 0.1 NM (2187)  One TXP 

4.2  Coverage
Throughout the inspection whilst within the DOC the DME receiver input shall not fall below –90 dBm (2188).
4.3  Identification
　
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