Obstruction Evaluation at site OBSTRUCTION EVALUATION FOR
SOUTF~TESTERN BELL MOBILE SYSTEMS
Performed by AIRSPACE SAFETY AI~ALYSIS CORPORATION
on February 5, 1994
SWB 3317 94
Southwestern Bell Mobile Systems
Coppell, Texas site
TOWER LOCATIQ~:
Latitude: 32~ 58' 10.12"
Longitude: 97~ 01' 23.01"
NAD 83
si%e Elevation: 523' AMSL
Tower Height: 101' AGL *
Overall Height: 624' ~SL
This. proposal is to increase the height of an existing
structure by 48'
745 Phoenix Boulevald
Suite 120
Atlardo, C~orgia 30349
aO4/9944557 - FAX 404/,;944637
IMPACT:
MINIMUM EN ROUTE ALTITUDE:
The proposed 101' AGL (624' A~$L) structure located at the
study site would not adversely effect low altitude en route
airways or training routes in the area.
VFR ROUTES:
No factor. The proposed 101' AGL (624' AMSL) structure
located at the study site would not adversely effect VR routes
or VFR routes in the area.
AIRPORT IMPACT:
The nearest airport to the study site is Dallas-Fort Worth
International. The ARP of this public use, instrumented
airport is located 27,148' (4.46 NM) on a True Bearing of
192.03- from the study site. The nearest landing surface, the
approach end of Runway 13L at Dallas-Fort Worth International,
is located 20,575' (3.38 NM) on a True Bearing of 178.08- from
the study site. A 101' AGL (624' AMSL) structure, located at
this study site, would not effect VFR flight operations at
Dallas-Fort Worth International.
Private use airports do not meet FAR 77 criteria and the FAA
would not consider them in its study of the proposed
structure. However, in the interest of flight safety, ASAC
considers private use airports in every study. ASAC found no
evidence of private use airports located near this site.
IFR effects will be discussed under section FAR 77.23 of this
report.
FAR 77 .AND TERPS ANALYSIS:
FAR 77.13 (a) (1) (Construction over 200' AGL at its site);
The proposed 101' AGL structure would not
effect this surface.
FAR 77.13 (a) (2) (i) (Structure within 20,000' from the
nearest runway at an airport with a
runway length of more than 3,200');
No factor. The nearest landing surface
is located 21,423' from the study site.
FAR 77.13 (a) (2) (ii) (Structure within 10,000' from the
nearest runway at an airport with a
runway length of le~s than 3,200');
No factor.
FAR 77.13 (a)(2) (iii) (Structure within 5,000' from the nearest
point of the nearest landing and takeoff
area of each specified heliport);
No factor.
* "Notice of Proposed Construction" is not required unless the
existing structure was filed with the
FAR 77.23 (a)(1) (Structure over 500' AGL);
No factor. The proposed 101' AGL
structure would not be effected by this
surface.
77.23 (a)(2) (Structure over 200' AGL or above the
established airport elevation, whichever
is higher, within 3 NM of the established
reference point of an airport which has a
runway more than 3,200 feet in length.
This height increases 100' for each
additional mile up to 500' AGL);
This surface is not a factor for a 101'
AGL structure.
FAR 77.23 (a)(3) (TERPS, Terminal Operations);
The site is located below airspace
protected for IFR approaches to Runways
17R, 17L, iSL and 18R at Dallas Fort
Worth International. However, the most
restrictive of these procedures, the S-
LOC RWY 17R and S-LOC RWY 17L approaches
would not be adversely effected by a 101'
AGL (624' AMSL) structure located at the
study site. However, the FAA would
likely ask for a survey with 2~C or
better accuracy if the structure exceeds
620' AMSL. A 1-A accuracy may be
requested for the 624' A/~SL structure.
(see Enclosure 2)
FAR 77.23 (a) (4) (TERPS, En Route Operations);
No factor.
FAR 77.23 (a) (5) (The takeoff and landing area of an
airport or any imaginary surface
established under FAR 77);
No factor. The study site is clear of
area airport's takeoff and landing areas
and imaginary surfaces.
FINDINGS:
1. The nearest airport to the study site is Dallas-Fort Worth
International. The ARP of this public use, instrumented
airport is located 27,148' (4.46 NM) on a True Bearing of
192.03° from the study site. The nearest landing surface, the
approach end of Runway 13L at Dallas-Fort Worth International,
is located 20,575' (3.38 NM) on a True Bearing of 178.08" from
the study site. A 101' AGL (624' AMSL) structure, located at
this study site, would not effect VFR flight operations at
Dallas-Fort Worth International.
2. Private use airports do not meet FAR 77 criteria and the FAA
would not consider them in its study of the proposed
structure. However, in the interest of flight safety, ASAC
considers private use airports in every study. ASAC found no
evidence of private use airports located near this site.
3. En route flight operations are not a factor for this proposal.
4. The ~tudy site is located below airspace protected for IFR
approach procedures established for Dallas-Fort Worth
International. However, the most restrictive of these
procedures, the S-LOC approach to RWY 17L and to RWY 17R,
would not be effected by the 101' AGL (624' A/~SL) structure.
Therefore, terminal IFR procedures would not be effected by
the proposed height increase-
5. At this site, a 101' AGL (624' ~2~SL) structure would not
exceed any FAR 77 surface. Therefore, FAR 77 would not
require FAA Notice or approval of the proposed height
increase. However, if the existing structure was filed with
the FAA, any alteration of that structure should also be filed
with the FAA.
Q~TIONS/RECOM~..~NDATIONS:
1. If the existing structure was field with the FAA, a 7460-1
Alteration Form should be filed for the proposed height
increase. This proposal would be approved by he FAA without
an extended study. However, if filed, the FAA may ask for a
survey of 2-C or better. A 1-A accuracy may be requested for
a 101' AGL (624' AMSL) structure.
The FAA should not request a survey if the structure does not
exceed 620' AMSL.
2. If the existing structure was not filed with the FAA, there is
not a requirement to file with the FAA for the 101' AGL (624'
AMSL) structure at this study site.
Should you have questions regarding this study, its findings,
options, or recommendations, please contact ASAC.