Notes on NACO Obstacle Departure Procedures

[John Clonts]

What's with these notes about all the obstacles? If I can fly the
take-off minimums and/or fly the ODP (if specified, not in the example
below), does such keep me clear of the noted obstacles? (I think the
answer is yes, but then-- what's the point?) Or do I have to do all
this pythagorea in my head?

Thanks,
John Clonts
Temple, Texas
N7NZ

Example:

KILLEEN, TX
KILLEEN MUNI
TAKE-OFF MINIMUMS: Rwy 19, 1300-2 or std. with a
min. climb of 250' per NM to 2500.
NOTE: Rwy 1, multiple poles, 317' to 759' from departure
end of runway, 484' to 384' left of centerline, 48' AGL/
865' MSL. Tree, 973' from departure end of runway, 100'
left of centerline, 49' AGL/876' MSL. Building, 486' from
departure end of runway, 10' right of centerline, 30'
AGL/854' MSL. Antenna, 351' from departure end of
runway, 277' right of runway, 28' AGL/852' MSL.
Rwy 19, pole, 288' from departure end of runway, 558'
right of centerline, 43' AGL/880' MSL. Building, 102'
from departure end of runway, 411' right of centerline,
22' AGL/856' MSL. Road, 231' from departure end of
runway, 498' right of centerline, 30' AGL/867' MSL.
Pole, 256' from departure end of runway, 497' left of
runway, 36' AGL/873' MSL. Building, 275' from
departure end of runway, 442' left of runway, 36' AGL/
859' MSL. Building, 298' from departure end of runway,
83' left of runway, 36' AGL/857' MSL.

[Barry]

> What's with these notes about all the obstacles? If I can fly the
> take-off minimums and/or fly the ODP (if specified, not in the example
> below), does such keep me clear of the noted obstacles? (I think the
> answer is yes, but then-- what's the point?)

Here's an explanation from the FAA's Instrument Procedures Handbook
(http://av-info.faa.gov/terps/IPH.htm):

Obstacles that are located within 1 NM of the DER [departure end of the
runway] and penetrate the 40:1 OCS [obstacle clearance surface] are referred
to as “low, close-in obstacles.” The standard ROC [required obstacle
clearance] of 48 feet per NM to clear these obstacles would require a climb
gradient greater than 200 feet per NM for a very short distance, only until
the aircraft was 200 feet above the DER. To eliminate publishing an excessive
climb gradient, the obstacle AGL/MSL height and location relative to the DER
is noted in the Take-off Minimums and (OBSTACLE) Departure Procedures section
of a given TPP booklet. The purpose of this note is to identify the obstacle
and alert the pilot to the height and location of the obstacle so they can be
avoided.