ord-d-gs27l-c004.pdf

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REVDRAWING NO

DATE JCN

APPROVED BY

ISSUED BY

CHECKED

DRAWN

DESIGNED

SUBMITTED BY

REVIEWED BY

FEDERAL AVIATION ADMINISTRATION

DEPARTMENT OF TRANSPORTATION

REV

DATE

APPROVED

DESCRIPTION JCN

DATE

REDLINE

APVD

A

1.

2.

3.

4.

5.

7.

6.

10.

11.

8.

9.

NOTES:

12.

ELEVATION

50’ GLIDE SLOPE ANTENNA TOWER

ELEVATION

LADDER ATTACHMENT TO ANTENNA TOWERPLAN

FALL ARRESTER

ANTENNA ELEMENT MOUNTING BRACKET

AND ANTENNA TOWER CONNECTIONS

OSHA TIE-OFF POINTS

TOWER LEG CONNECTION

DETAIL

NOT TO SCALE

DETAIL

NOT TO SCALE

DETAIL

NOT TO SCALE

DETAIL

NOT TO SCALE

3 4 5

DETAIL

NOT TO SCALE

DETAIL

NOT TO SCALE

S

E

N O

T E

S

T E

S

T E

PER NOTE 3

GROUNDING LUG

GROUNDING WIRE

6 AWG BARE COPPER

S

T E

P/N 506277

MSA DYNA-GLIDE

FALL ARRESTER

FURNISH

TOWER LEG

TOWER LEG

HEX BOLT (TYPICAL)

7/8"-9 X 2 1/2"

SEE NOTE 1

GALVANIZED LOCK WASHER

GALVANIZED 7/8"-9 HEX NUT

TOWER LEG

WITH ANTENNA TOWER)

LADDER (FURNISHED

GALVANIZED STEEL

NO SUBSTITUTIONS. SEE NOTE 4

NOTCHED RAIL, P/N 506270

MSA DYNA-GLIDE GALVANIZED

FURNISH AND INSTALL

CROSS-BRACE

ANTENNA TOWER

SAFETY CLIMB RAIL SYSTEM

DYNA-GLIDE GALVANIZED

CLIMB RAIL, MSA

GALVANIZED SAFETY

FURNISH AND INSTALL

CONNECTORS PER SPECIFICATIONS.

GROUND WIRE WITH CRIMPED

SECTIONS USING 6 AWG INSULATED

WITH ANTENNA TOWER). BOND LADDER

GALVANIZED STEEL LADDER (FURNISHED

LOOP WITH PARALLEL CLAMPS.

ON SPARATE LEGS CONNECTED TO

INSTALL TWO DOWN CONDUCTORS

CONNECT TO AIR TERMINAL, AND

CLOSED LOOP AT TOP OF TOWER,

CLASS II DOWN CONDUCTOR, FORM

AIR TERMINAL

HEX NUT

3/8"-16 SS

FRAME SECTION

ANTENNA MOUNTING

3/8" SS LOCK WASHER

WITH LADDER)

HARDWARE FURNISHED

(TYPICAL, ATTACHING

1/2" U-BOLT

WITH LADDER)

HARDWARE FURNISHED

(TYPICAL, ATTACHING

1/2" U-BOLT

ANTENNA TOWER CROSS-BRACE

ARE FURNISHED BY FAA)

AND ATTACHING HARDWARE

MOUNTING FRAMES,

(TYPICAL OF THREE,

ANTENNA ELEMENT

ANTENNA MOUNTING BRACKET (TYPICAL)

ANTENNA TOWER LEG

(TYPICAL)

ANTENNA TOWER LEG

SEE NOTE 3.

GROUNDING CLAMP.

OF TWO PER LEG)

3/8"-16 (TYPICAL

3" U-BOLT CLAMP,

ANTENNA MOUNTING CHANNEL

OF TWO PER LEG)

SUPPORT ANGLE (TYPICAL

3/8"-16 SS HEX NUT

3/8" SS LOCK WASHER

CONTRACTOR FURNISHED

OBSTRUCTION LIGHT

SECTION. SEE NOTE 2.

5’ ORANGE TOP

(TYPICAL). SEE NOTE 1

PER DETAIL "3"

TOWER LEG CONNECTION

SECTION. SEE NOTE 2.

5’ ORANGE

MOUNTING FRAME

ANTENNA

BRACKET C

ANTENNA

L

SECTION. SEE NOTE 2

20’ ORANGE/WHITE

MOUNTING DETAILS

OF 3). SEE DETAIL "2" FOR

ANTENNA ELEMENT (TYPICAL

CABLE CONDUIT

POWER AND SIGNAL

BOTTOM. SEE NOTE 2

SECTION W/ORANGE ON

20’ ORANGE/WHITE TOWER

FOUNDATION

REINFORCED CONCRETE

3/8"-16 X 1 1/2" SS HEX BOLT

LOCK CHANNEL (TYPICAL)

ANTENNA MOUNTING CHANNEL

3/8"-16 SS HEX NUT

LOCK WASHER

3/8" SS

LOCATION (TYP 3)

AT ANTENNA BRACKET

TOWER LEG APPROX.

SECURE TIE-OFF TO

TIE-OFF POINTS.

CONTRACTOR FURNISHED

SEE NOTE 14

13.

14.

15.

SPECIFICATION GL-D-918D.

THIS SHALL BE ACCOMPLISHED PER PARAGRAPH 28 OF THE SPECIAL SPECIFICATIONS AS WELL AS SECTION 9A OF

THE GLIDE SLOPE ANTENNA MASTS ARE GOVERNMENT-FURNISHED AND NEED TO BE REPAINTED PRIOR TO ERECTION.

DIRECTION. COORDINATE WITH THEM TROUGH FAA COTR.

SET TIE-OFF POINTS AT SAME ELEVATION AS ANTENNAS. RELOCATE TO FINAL LOCATION PER FAA DISTRICT EOSH PERSONELL

TOWER BOLT TORQUE VALVES ARE PER NATIONAL STANDARD ACCEPTED DESIGN PER BOLT & NUT SIZE.

IN TURNOVER BINDERS.

PROVIDE A SURVEY SHOWING LOCATION, ELEVATIONS & PLUMBNESS OF ANTENNA MAST AFTER INSTALLATION. PROVIDE

TIE-OFF HARDWARE ASSEMBLIES.

FAA SSC AND FURNISH AND INSTALL THE DYNA-GLIDE CLIMB SYSTEM. THE CONTRACTOR SHALL ALSO INSTALL AND SUPPLY OSHA

A SAFETY CLIMBING SYSTEM WITH A ROUND NOTCHED BAR ARE SHIPPED WITH THE ANTENNA TOWER. DELIVER THESE PARTS TO THE

THE CONTRACTOR MUST MAKE THE NECESSARY TOWER HEIGHT ADJUSTMENT TO FLIGHT CHECK AS DIRECTED BY THE FAA.

CLIMBING SYSTEM. NO SUBSTITUTIONS. SEE DWG ORD-D-GS27C-C005-1.

CONTRACTOR MUST FURNISH AND INSTALL LADDER CLIMBING SAFETY SYSTEM. LADDER CLIMBING SYSTEM SHALL BE DYNA-GLIDE

AND INSTALL GS ANTENNA COAXIAL CABLES. ALL OTHER ITEMS SHOWN HERE BY CONTRACTOR UNLESS OTHERWISE NOTED.

FAA TO FURNISH AND CONTRACTOR TO INSTALL GLIDE SLOPE TOWER, ANTENNAS, AND ANTENNA MOUNTING KITS. FAA TO FURNISH

CENTER OF THE ANTENNA. THE LADDER POSITION MUST BE APPROVED BY THE FAA PRIOR TO INSTALLATION.

RUNWAY THRESHOLD. LADDER SHALL BE INSTALLED CLOSER TO THE READ LEG OF ANTENNA MAST TO ALLOW ACCESS TO THE

INSTRUCTED BY FAA. THE LADDER SHALL BE INSTALLED ON THE RIGHT SIDE OF THE ANTENNA TOWER WHEN LOOKING TOWARD THE

THE CONTRACTOR MUST USE OFFSET BRACKETS IN PLACE OF U-BOLT ASSEMBLIES ON THE ANTENNA, FOUR PER ANTENNA IF

THE CONTRACTOR SHALL RE-PAINT ANY AREAS DAMAGED DURING CONSTRUCTION, SHIPPING.

THE CONTRACTOR SHALL PROVIDE AN LED OBSTRUCTION LIGHT TO REPLACE THE GFM INCANDESCENT TYPE PROVIDED WITH TOWER.

SEE THE GOVERNMENT-FURNISHED PROPERTY LIST FOR ITEMS PROVIDED BY THE FAA. ALSO SEE DWG ORD-D-GS27L-C005-1.

AND 6 AWG BARE COPPER GROUNDING WIRE. CONNECT 6 AWG BARE TO ANTENNA TOWER STRUCTURE USING GROUNDING CLAMP.

FIELD-DRILL 3/8" DIAM. HOLE IN ANTENNA MOUNTING FRAME, SCRAPE PAINT FROM BONDING AREA AND INSTALL GROUNDING LUG

ORIGIN. ALL BARE METAL SHALL BE TREATED WITH ZRC GALVILITE GALVANIZING REPAIR COMPOUND.

CONDUCTOR, AND OBSTRUCTION LIGHT TO TOP OF SHORTENED TOWER. NON-CONTINUOUS CROSS-BRACING SHALL BE CUT AT ITS

CONTRACTOR TO CUT ANTENNA TOWER STRUCTURE, LADDER, AND SAFETY CLIMBING SYSTEM AND RELOCATE AIR TERMINAL, DOWN

SHORTEN THE TOWER TO 5’’-0" MAXIMUM HEIGHT ABOVE CENTERLINE OF TOP ANTENNA ELEMENT. THIS WILL REQUIRE THE

5’-0" BELOW TOP OF TOWER, TOWER MUST BE SHORTENED. CONTRACTOR SHOULD INCLUDE COSTS TO RETURN TO THE SITE AND

BE ADJUSTED BY FAA INSTALLATION PERSONNEL TO ACHIEVE BEST SIGNAL GENERATION. IF TOP ANTENNA ELEMENT IS MORE THAN

MATCH THE NEW ANTENNA HEIGHTS WITH THE ADJACENT GLIDE SLOPE TOWER ANTENNA HEIGHTS. ANTENNA ELEMENT LOCATIONS WILL

WITH ELEMENT CENTERED ON THE MOUNTING BRACKETS AT THE DESIGN HEIGHTS PROVIDED BY THE ELECTRONICS ENGINEER.

THE TOWER IS PLUMB. THE CONTRACTOR SHALL INSTALL ANTENNA MOUNTING BRACKET AND ELEMENT ASSEMBLIES (3 REQUIRED)

CONTRACTOR SHALL ERECT TOWER WITH ALTERNATING ORANGE AND WHITE COLORED SECTIONS TO FULL 50’ HEIGHT. VERIFY THAT

FOR ELECTRICAL CONTINUITY BETWEEN THE TOWER SECTIONS.

CONTRACTOR SHALL TACK-WELD THE BOLTED CONNECTIONS ON ANTENNA TOWER LEG TO WHICH GROUNDING ASSEMBLY IS ATTACHED

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10/31/2019 1898272

ORD-D-GS27L-C004

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ENGINEERING SERVICES

GS

CHICAGO O’HARE INTERNATIONAL AIRPORTCHICAGO

PROJECT ENGINEER MGR: ENGINEERING

o rd -d -g s l-c .d g n

THIS DRAWING PRODUCED ON THE AGL REGION MICROSTATION SYSTEM

ATO - TECHNICAL OPERATIONS CENTRAL SERVICE AREA

GLIDE SLOPE - RUNWAY 27L

ANTENNA TOWER ASSEMBLY DETAILS