Advisory Circular

U.S.
Department

of Transportation

Federal Aviation

Administration

Subject: SPECIFICATION FOR DISCHARGE-TYPE FLASHING LIGHT EQUIPMENT

Date:  09/19/05

Initiated by:  AAS-100

AC No.:  150/5345-51A

Change: 

PURPOSE.  This advisory circular (AC)
contains the specifications for discharge-type flashing light equipment
to be used for runway end identification lights (REIL) and for an omni-directional
approach lighting system (ODALS). 
EFFECTIVE DATES. Effective six months after
the issue date of this advisory circular, only equipment certified per
the specifications herein will be listed per AC 150/5345-53, Airport Lighting Equipment Certification Program.
CANCELLATIONS. Advisory Circular 150/5345-51,
Change 1, Specification for Discha</span><span class="Normal--Char" style=" font-style: italic;
color: #000000;">rge-Type Flashing Light Equipment, dated 01/04/82,
is cancelled. 
APPLICATION.  The specifications contained
in this AC are recommended by the Federal Aviation Administration (FAA)
in all applications involving development of this nature. For airport
projects receiving Federal funds under the airport grant assistance
program, the use of these standards is mandatory.
PRINCIPAL CHANGES.

Added L-849V and L-859V to designate
systems that can be operated from an airport 120/240 volt AC voltage
source.
Added L-849I, and L-859I to designate
systems that can be operated from a 6.6A constant current series circuit.
Expanded the criteria for control
voltages.
Revised the lightning protection criteria.
Added a requirement for radiated and
conducted emissions. 
Upgraded environmental tests.
Due to availability problems associated
with military temperature range components, changed the low temperature
requirement to accommodate more commonly available industrial temperature
range commercial integrated circuits and semiconductors.
Added a table to correlate equipment
brightness levels with constant current regulator current steps.
Deleted the requirement for Sand and
Dust environmental testing.   

METRICS.  To promote an orderly transition
to metric units, this AC contains both English and metric dimensions. 
The metric conversions may not be exact metric equivalents, and, until
there is an official changeover to the metric system, the English dimensions
will govern.

DAVID L. BENNETT

Director of Airport Safety and Standards

 

TABLE OF CONTENTS

LIST OF TABLES

 

1.  SCOPE AND CLASSIFICATION.

1.1 
Scope. 

The
flashing light equipment in this specification is used for runway end
identification lights (REIL) and for an omni-directional approach lighting
system (ODALS).

1.2 
Classification.

Four
types and six styles of flashing light equipment are in this specification.

1.2.1  Types.

L-849V REIL powered by airport voltage power source

L-849I REIL powered by constant current 6.6 A power supply

L-859V ODALS powered by airport voltage power source

L-859I ODALS powered by constant current 6.6 A power supply

1.2.2  Styles.

A - Unidirectional, high intensity, one brightness step.

B - Omni-directional, high intensity, one brightness step.

C - Unidirectional, low intensity, one brightness step.

D - Omni-directional, low intensity, one brightness step.

E - Unidirectional, three brightness steps.

F - Omni-directional, three brightness steps. 

All styles apply to Type L-849, only Style F applies to Type L-859.

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2.  REFERENCED DOCUMENTS. 

2.1 
General.

The
following is a listing of documents referenced in this document.

2.1.1  Federal Aviation Administration
(FAA) Publications.

2.1.1.1 
FAA Advisory Circulars.

AC 150/5345-10 Specification for Constant Current Regulators Regulator
Monitors

AC 150/5345-43 Specification for Obstruction Lighting Equipment

AC 150-5345-47 Specification for Series to Series Isolation Transformers
for Airport Lighting Systems

AC 150/5345-53 Airport Lighting Equipment Certification Program

2.1.1.2 
FAA Drawing.