AC 70/7460-1L

Historical

Advisory circular · Obstruction Marking and Lighting

A newer version is currentThis is a historical version. AC 70/7460-1M is the version in force, approved November 6, 2020.
Approved
December 4, 2015
Last reviewed
December 4, 2015
Cancelled by
AC70/7460-1M
Family
AC 70/7460-1 · 7 versions
Revision
L
14 CFR parts
77

Guidance, not mandatory unless a rule or AD requires it. DRS record last changed December 4, 2015.

Show pages 59–70
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Appendix A

HIGH-INTENSITY DUAL OBSTRUCTION LIGHT

STANDARDS (FAA STYLE F) STRUCTURE WITH APPURTENANCE GREATER THAN 40 ft (12 m) Day Protection = 270,000 cd White Light Twilight Protection = 20,000 cd White Light Night Protection = 2,000 cd Red Light Above 1,750 ft - 2,200 ft (533 m - 671 m) Above 1,400 ft - 1,750 ft Appurtenance exceeding (427 m - 533 m) 40 ft (12 m) above the structure Above 1,050 ft - 1,400 ft (320 m - 427 m) Above 700 ft - 1,050 ft (213 m - 320 m) For towers 700 ft (213 m) and below, see the appropriate medium-intensity FAA style sheet F3 F4 F5 F6 = 1-856 (Flashing White Light) = L-864 / L-865 (Flashing Dual [Red / White] Light) (3 flash heads required per level for 360° coverage) L-864 configured to flash at a rate of 30 fpm (+ 3 fpm) = L-864 (Flashing Red Light) Configured to flash at a rate of 30 fpm (+ 3 fpm) Figure A-11. High-Intensity Dual Obstruction Lighting Standards-Structures With Appurtenance Over 40 Feet High A-12

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Appendix A

HIGH-INTENSITY DUAL OBSTRUCTION LIGHT

STANDARDS (FAA STYLE G) STRUCTURE WITH APPURTENANCE 40 ft (12 m) OR LESS Day Protection = 270,000 cd White Light Twilight Protection = 20,000 cd White Light Night Protection = 2,000 cd Red Light Above 1,750 ft - 2,200 ft (533 m - 671 m) Appurtenance Above 1,400 ft - 1,750 ft 40 ft. (12 m) or less (427 m - 533 m) Above 1,050 ft - 1,400 ft (320 m - 427 m) Above 700 ft - 1,050 ft (213 m - 320 m) For towers 700 ft (213 m) and below, see the appropriate medium-intensity FAA style sheet G3 G4 G5 G6 = L-856 (Flashing White Light) (3 flash heads required per level for 360° coverage) = L-864 (Flashing Red Light) Configured to flash at a rate of 30 fpm (+ 3 fpm) Figure A-12. High-Intensity Dual Obstruction Lighting Standards-Structures With Appurtenance 40 Feet or Less A-13

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Appendix A

DUAL LIGHTING POLES, TOWERS, LIGHTING AND PAINTING

AND SIMILAR STRUCTURES OF CHIMNEYS Day Protection = 270,000 cd White Light Day / Twilight Protection = Aviation Orange / White Paint Twilight Protection = 20,000 cd White Light Night Protection = 2,000 cd Red Light Night Protection = 2,000 cd Red Light As low as 20 ft (6 m) Appurtenance over 40 ft (12 m)

• Above 700 ft (213 m) but not more than 1,050 ft (320 m) Above 700 ft (213 m) but not more than 1,050 ft (320 m) =L-864 (Flashing Red Light) =L-856 (Flashing White Light) = L-864 / L-865 (Flashing Dual [Red / White] Light Figure A-13. Painting and/or Dual Lighting of Chimneys, Poles, Towers, and Similar Structures A-14

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Appendix A

MEDIUM-INTENSITY LIGHTING

ESTABLISHING THE LOCATION OF TOP BEACONS Day Protection = 20,000 cd White Light Night Protection = 2,000 cd Red Light Top of lightning rod (less than seven-eighth in. (2.2 cm) diameter) Top of Communications Antenna Top of Antenna Support - Top of Structure Structure 10 ft (3 m) Max Overall AGL height when determining light levels Towers shown are above 350 ft (107 m) but less than 700 ft (213 m) Obstruction light should be mounted above all appurtenances Obstruction lights can be mounted within excluding anything less than seven-eighth in. (2.2 cm) diameter 10 ft (3 m) from the overall height = L-864 (Flashing Red Light) = L-865 (Flashing White Light) = L-864 / L-865 (Flashing Dual Light) Figure A-14. Medium-Intensity Lighting-Establishing the Location of Top Beacons A-15

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Appendix A

PAINTING AND LIGHTING OF WATER TOWER, STORAGE TANKS,

AND SIMILAR STRUCTURES Day Protection = Aviation Orange / White Paint Night Protection = 2,000 cd Red Light and 32 cd Red Steady-Burning Side Lights Above 150 ft (45 m) but not more than 350 ft (108 m) Above 150 ft (45 m) but not more than 350 ft (108 m) = 1-864 (Flashing Red Light) =L-810 (Steady-Burning Red Light) Figure A-15. Painting and Lighting of Water Towers, Storage Tanks, and Similar Structures A-16

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Appendix A

PAINTING AND LIGHTING OF WATER TOWERS

AND SIMILAR STRUCTURES Day Protection = Aviation Orange / White Paint Night Protection = 2,000 cd Red Light and 32 cd Red Steady-Burning Side Lights The number of light units recommended depends on the diameter of the structure Above 150 ft (45 m) but not more than 350 ft (108 m) = L-864 (Flashing Red Light)

• =L-810 (Steady-Burning Red Light) Figure A-16. Painting and Lighting of Water Towers and Similar Structures A-17

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Appendix A

PAINTING OF SINGLE PEDESTAL WATER TOWER

BY TEARDROP PATTERN Day Protection = Aviation Orange / White Paint Night Protection = By Flood Light JAN ‚USA = 360° Coverage of the Water Tower (Flood Light) Figure A-17. Painting a Single Pedestal Water Tower Using the Teardrop Pattern A-18

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Appendix A

LIGHTING ADJACENT STRUCTURES

LIGHT LEVEL ADJUSTMENT Day Protection = 270,000 cd White Light (Painting is typically not required) Twilight Protection = 20,000 cd White Light Night Protection = 2,000 cd White Light Inboard lights recommended on all levels above height of shorter structure 500 ft or less (153 m) 795 ft (242 m) Lower inboard lights may be omitted 534 ft = = (166 m) 545 ft (163 m) 800 ft (244 m) 275 ft !

270 ft (84 m) ** 267 ft 82 m) 550 ft

• (81 m) (168 m) Minor adjustments in vertical placement may be made to place lights on same horizontal plane (Lights on both structures to be synchronized) = L-856 (Flashing White Light) = L-865 (Flashing White Light) Figure A-18. Lighting Adjacent Structures-Light Level Adjustment A-19

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Appendix A

LIGHTING ADJACENT STRUCTURES Day Protection = 270,000 cd White Light (Painting of tower is typically not required) Twilight Protection = 20,000 cd White Light Night Protection = 2,000 cd White Light 500 ft (153 m) or less

• 0 Inner levels ce o may be omitted 750 ft (229 m) 250 ft (76 m) Lowest level should be above adjacent structure Structures of equal height. Number of levels depends upon height of structure (Lights on both structures to be synchronized) Top level display all units" 500 ft or less 500 ft or less_ (153 m) (153 m) Lower inner levels may be omitted One structure higher than the adjacent structure and light levels are on same horizontal plane (Lights on both structures to be synchronized) = L-856 (Flashing White Light) =L-865 (Flashing White Light) One structure higher than the adjacent structure and light levels are on same horizontal plane (Lights on both structures to be synchronized) Figure A-19. Lighting Adjacent Structures A-20

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Appendix A

LIGHTING OF CHIMNEYS, FLARE STACKS,

OR SIMILAR SOLID STRUCTURES Day Protection = 270,000 cd White Light (Painting of tower is typically not required) Twilight Protection = 20,000 cd White Light Night Protection = 2,000 cd White Light b - Exceeding 20 ft (6 m) but not more than 100 ft (31 m) a - 20 ft (6 m) or less 800 ft (244 m) 300 ft (91 m) = L-856 (Flashing White Light) = L-865 (Flashing White Light) Figure A-20. Lighting of Chimneys, Flare Stacks, or Similar Solid Structures A-21

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Appendix A

LIGHTING HYPERBOLIC COOLING TOWERS Day Protection = 270,000 cd White Light (Painting of tower is typically not required) Twilight Protection = 20,000 cd White Light Night Protection = 2,000 cd White Light a - The number of light units recommended depends on the a - Exceeding 100 ft (31 m) diameter of the structure but not more than 200 ft (61 m)

- b b - Exceeding 200 ft (61 m) IWA = L-856 (Flashing White Light) Figure A-21. Hyperbolic Cooling Tower A-22

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Appendix A

BRIDGE LIGHTING Day / Twilight Protection = 20,000 cd White Light Night Protection = 2,000 cd Red or White Light or Flood Lighting * Shown above as L-864 / L-865 (Flashing Dual Light) Marine navigational lighting not shown = L-864 (Flashing Red Light)

- = L-865 (Flashing White Light) = L-864 / L-865 (Flashing Dual Light) Figure A-22. Bridge Lighting A-23