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119 Cards in this Set

  • Front
  • Back
Who is responsible for the establishment, administration, and direction of an inspection and maintenance program for the towers under their jurisdiction.
Commanding Officers of Civil Engineering Units
A channel of clearly fixed responsibility for tower inspection and maintenance shall be established from _____
Civil Engineering Unit (CEU)
Since differences in tower designs, materials, age, local environment, and previous maintenance are some of the factors of the inspection and maintenance program, standards shall be established by the
servicing CEU
____is a primary consideration to which all Coast Guard personnel must devote their complete attention whenever they are climbing a tower or are in the immediate vicinity of atower of any height.
Safety
All personnel engaging in construction, maintenance, repair or inspection shall use _____________when working on any Coast Guard tower.
Fall Protection
Safety precautions also include the use of appropriate protective clothing to include the wearing of________
safety helmets, safety footwear, eye protection, and protective clothing
A safety helmet is required to be worn by any person within the tower drop zone, which is an area whose radius is ____________ and centered on the tower axis.
1/2 the height of the tower
When climbing to a height of 150ft or less a _______ is required on the ground.
safety observer
The safety observer shall have constant ________ with the climber on the tower.
two-way communication
When climbing towers greater than ___ft in height the safety observer shall join the primary climber on the tower and stay within ___ft of the primary climber at all times.
150, 150
The _________ has the authority to administer the Tower Climber Certification program for all units within its area of responsibility (AOR).
servicing CEU
At a minimum, the prospective climber shall have adequate knowledge of the following subjects:
1. Recognition and avoidance of dangers relating to encounters with harmful substances and animal, insect, or plant life.
2. Use and inspection of personal fall-arrest equipment.
3. Procedures to be followed in emergency situations.
4. Rescue procedures.
5. First aid training including CPR
What are the minimum requirements to qualify an individual to climb elevated structures.
1. The climber must be a responsible volunteer.
2. The climber must be physically qualified and physically capable.
3. The unit commander must recommend the climber.
4. The climber must complete climbing certification training
5. On the first climb the climber must be accompanied by a qualified Coast Guard military or civilian engineer
6. The climber shall be issued a written qualification letter from the servicing CEU.
All Personal Protective Equipment used must meet the standards of
29 CFR 1926.502, Fall Protection System Criteria and Practices, Subpart M, Fall Protection.
Personal Fall Arrest Systems consist at minimum of______
an anchorage, full body harness, deceleration lanyard and connecting device.
All connecting hardware must have a minimum tensile strength of______
5000 pounds and shall be proof tested to a minimum of 3600 pounds.
The working load limit is equal to the combined ____ and _____ weight. Generally, the working load limit for a full body harness is ____ pounds.
Person, Tool, 310
Each piece of equipment shall be inspected for wear, damage, and other deterioration before each use, and defective components shall be immediately _____ from service and ________.
Removed , Destroyed
Climbing is a physical process and requires practice to do it
correctly. CLIMB WITH YOUR ______ AND NOT YOUR ______.
Legs, not arms
Use of a safety climb device requires that you keep _____ points of contact with the structure.
three
There are _____ generally accepted rescue techniques.
Five
What are the Five rescue techinques?
1. Manual rescue
2. Outside Services
3. Winch Rescue
Ascending/Descending Systems
5. Approved suspension systems
The tower should not be climbed when?
In inclement weather, when electrical storm activity is forecast, or when fog obscures that portion of the tower to be climbed.
Only LORAN-C towers may be climbed while
energized
NDGPS and DGPS shall ______ climbed under any circumstances
while energized
not be
The servicing CEU should maintain a complete file for each tower or antenna system containing:
a. Inspection reports.
b. Specifications used for inspection or maintenance.
c. Correspondence pertaining to the particular tower or antenna.
d. Records of all maintenance or modifications.
e. Updated inventory of tower spare parts.
f. Pertinent procurement documents.
What are the four inspection categories for towers?
1. Tall Tower Coordination Center (TTCC) Level
2. Major Field Command Level
3. Intermediate Level
4. Unit/Field Level
This category of responsibility includes policy development, technical assistance to support CEUs, MLCs and other units involved with the tower program.
Tall Tower Coordination Center (TTCC) Level
This is the primary level of
responsibility and rests with the CEU.
Major Field Command Level
Inspection on a ______is the most effective way to protect the Coast Guard's investment in towers.
periodic basis
Typically ESUs, Groups and some elements of MLC staff fall into this category depending on the tower function.
Intermediate Level
Because of seasonal storm cycles, antenna systems should be carefully inspected ________
about once per year
The ability of the inspector to detect _____and to recognize _____ is of paramount importance.
potentially hazardous conditions, serious defects
Most tower inspections can be adequately performed by __________ familiar with general maintenance requirements and practices.
Coast Guard personnel
Considering their full time availability, station personnel should be used to the maximum possible extent for _______ inspections.
ground level tower
A daily inspection at a manned tower site should consist of?
Visually check the lights after sunset unless monitored by an automatic failure alarm system.
A weekly inspection at a manned tower site should consist of?
Visually check all guy assemblies and tower structural members from two or more good vantage points on the ground. For energized towers, check for visible or audible corona or arcing on any antenna system components.
A annual inspection at a manned tower site should consist of?
CEU and or contracted tower inspection for tall towers.
A monthly inspection at a manned tower site should consist of?
Visually check each anchor and the tower for abnormal conditions (see ¶C.3.a above). Visually check tower alignment in accordance with Ch.8 ¶G.1.a.
The primary purpose of maintenance is to _______ so that they will not cause unnecessary off-air time or develop into costly repair projects.
correct deficiencies in the early stages
maintenance by station personnel should be at the ground level only, including such items as
(1) Treatment of corrosion and corrosion control.
(2) Repair of the ground system.
(3) Repairs to the lighting system.
(4) Installation of safety wire at anchors.
(5) Renewal of non-structural components, such as cotter keys.
(6) Cleaning of insulators.
(7) Adjustment of ball gaps.
(8) Clearing of vegetation around the guy anchors and tower base.
The most common conditions with which the inspection process is concerned are
tower misalignment, wear, deformation, corrosion, improper guy tensions, and damaged structural members.
Most failures in a 625-ft or 700-ft. Loran-C Tower are attributed to the _________.
hidden corrosion of the steel core of ACSR cable
Structural grade ___ and ___ are used for tower structural members.
galvanized steels and aluminum alloys
Structural steels are utilized for the _____ towers.
taller
Stainless steels are used for special purposes such as where _______ is required.
greater corrosion-resistance
The galvanizing layer on steel can last from ___ to ___ years depending on the severity of the environment and the quality of the original construction.
10 to 40
The two important characteristics which differentiate stainless steels from ordinary carbon steels are ________.
coefficient of thermal expansion and resistance to corrosion.
(True, False)
Generally, all structural components on taller towers are made of galvanized steel.
True
Inspection and maintenance of structural metals will be concerned with ______.
corrosion, wear, deformation, and premature failures.
Single cone-shaped base insulators are generally used for the ______ towers.
smaller guyed
Single cylinder insulators are used for support of some ___ and ___ foot towers.
625, 700
____ ____base insulators are used for 625 and 1350 foot towers.
Multiple cylinder
Porcelain insulator elements will require _______ structural maintenance.
little, if any
The tower base foundations are normally constructed of _______ and are designed to support the vertical and horizontal (if self supporting tower) forces imposed by the tower.
reinforced 3,000psi concrete
At many towers, the base insulator rests on top of _______that are bonded to the ground system.
copper ground straps
It has been established that the only bonding connection which is necessary between the base plate of the insulator and the grounding system is a single ________ .
#8 AWG conductor
Climbing devices should be visually inspected for cracks when?
before each use.
The use of ________ safety rails is recommended in corrosive environments to reduce maintenance.
stainless steel
Most antenna towers and antenna support structures must be ________ to maintain proper electrical and counterpoise characteristics for the antenna.
properly grounded
Loran tower ground systems consist of _______bonded to _______ and extending outward from the tower base toward the tower guy or radial anchors.
copper wire radials, tubing or screen
Depending on the type of antenna and the type of soil conditions involved, radial ground wires will be required every _____ degrees in a full circle around the tower base.
1 to 4
There are normally ____ structural guy lanes for a guyed tower and up to ____ lanes when designating top loading radials of some Loran-C towers
three, 24
Guy Anchors are designated by a letter and number. The anchors _______ the tower are designated “A”, the next farthest ____, and so on.
nearest, “B”
Tower attachment levels are numbered _______ from the _____ level up.
consecutively, lowest
“4-B2” is the guy leading from the 4th ____ attachment point to _______ B in ______ 2, on a corner-guyed tower.
guy level, Anchor, guy lane
“3B-A1” is the right hand guy leading from the ___ guy level attachment point to anchor __ in guy lane __ , on a face-guyed tower.
3rd, A, 1
"C13" is a radial guy that is the 13th such guy _____ from North.
clockwise
Ceramic and fiberglass insulators whose insulating element is in tension are generally known as?
"strain insulators"
What is composed of individual wires laid helically about an axis or center wire that produces a symmetrical crosssection?
Wire Strand
GUY ATTACHMENT LEVELS ARE NUMBERED FROM THE ________.
LOWEST LEVEL UP
GUY ANCHORS ARE INDICATED BY A LETTER STARTING WITH "__" CLOSEST TO THE TOWER AND PROCEEDING OUTWARD.
"A"
GUY LANE DESIGNATIONS ARE DEPENDANT UPON THE DIRECTION OF TRUE NORTH. LANE #1 IS THE FIRST LANE ________.
CLOCKWISE FROM NORTH.
Which of the following is the correct labeling for a corner guyed tower and which is for a faced guyed tower:
A. 3-B1
B. 3A-B1
A. Corner Guyed Tower
B. Faced Guyed Tower
What is the most common and continuing inspection and maintenance problem for guy cable and end fittings.
Corrosion Control
The tower anchors are normally constructed of what and are designed to support the vertical and horizontal forces imposed by the tower.
reinforced 3,000psi concrete
The two major elements of guy anchors are what?
Concrete
Anchor Steel
In order to preserve the original design conditions, the soil surrounding anchors must be what?
Maintained in a stable and well-compacted condition with the ground surfaces sloped away from the anchor arms to provide adequate drainage
Tower painting is accomplished for three reasons, what are they?
· To provide obstruction marking, if required by the FAA;
· To extend the life of galvanizing;
· To help prevent corrosion.
The reason for painting with the orange and white color bands is to meet what?
The visibility requirements of the FAA
The Federal Aviation Administration recommends that all towers presenting a hazard to air commerce be marked with alternating bands of aviation surface orange and white unless they are marked with what?
high-intensity lighting systems.
Who is responsible to determine whether the marking of new towers is required, and to ensure that all towers are marked as required by the FAA.
Civil Engineering Unit
The current scheme for color band characteristics calls for each band to be approximately _______, for towers not exceeding 700ft in height.
1/7 the tower height
An existing paint system that may contain _______ cannot be neglected regardless of FAA marking requirements.
lead paint
In order to perform properly under wind and/or ice loadings, the alignment and twist of a tower under no-load conditions must be ______ imposed by the tower designer.
maintained within the limitations
Guyed towers are usually triangular in cross-section and have a _______ .
constant face width
Self-supported towers may be triangular or _____ in cross-section and may either have a constant face width or ____ with height.
square, taper
Temporary misalignment and twist can result from what?
wind and ice load
Permanent misalignment and twist can be caused by what?
improper guy tensions.
What are the 5 methods for determining alignment?
a. Visual Check.
b. Transit Check Method.
c. One-Leg Method.
d. TIA/EIA Method.
e. Allowable Deflections.
What are the 5 methods for determining twist?
a. Leg Sighting.
b. T-Square Method.
c. Visual Check Method.
d. Boresighting.
e. Transit Check Method.
what is the most simple and most accurate of all methods, but climbing the tower is necessary, to determine twist?
Leg Sighting
This method is sometimes referred to as "Walking the Radials" and used for determining twist.
Visual Check Method
What are the methods for measuring Guy tension?
a. Calipers
b. Tensiometers
c. Slope Measuring Device (SMD)
d. Tension Measuring Device (TMD)
e. Hydraulic Tensioning Device
f. Shunt Dynamometers
g. Visual Sag Method
A guy tension caliper is a scissors-type device that is quick and simple to use, and is ideal for guys whose initial tensions do not exceed _____lbs.
3000 lbs
Correction of alignment will involve an adjustment to guy tensions, but these changes should not be such that the guy tensions become what?
out of tolerance
Tower alignment, twist, and guy tension checks should be made on a _______ at a frequency to be determined by major field commanders.
regular basis
The FAA Advisory Circular 70/7460-1(series) uses ______ as a threshold for determining whether a tower or structure is an obstruction and therefore must be marked (painted or lighted).
200ft
It is the responsibility of the ___ to ensure that the tower lighting system conforms to the appropriate standards.
CEU
Typically, ______ coded beacons are installed at the top of all towers over 200 feet in height and at one or more intermediate levels for towers in excess of ___ feet.
300-mm, 350
Most flashing beacons are controlled by a ________ .
solid state flasher mechanism
A steady ____/____ obstruction light is required at the top of obstructions less than ____ feet in height.
burning/fixed , 150
The photoelectric relay (a.k.a. photocell) is used to ________ the lighting system.
automatically energize and de-energize
Isolation transformers provide a means of supplying _____ across the base insulator of an energized tower while providing __________ between the tower and ground.
60 Hz power, high RF impedance
True or False
Conduit is no longer authorized in the tower lighting system.
True
The voltage at each lamp socket should be checked and to comply with FAA standards, may not vary more than ___ from the rated lamp voltage.
3%
What are the three types of tower lamps?
a. Obstruction Lamps
b. Beacon Lamps
c. Supply of Lamps
The flasher unit and photocell should be checked and verified as operable how often?
at least monthly
Whenever the tower is de-energized for inspection or maintenance, the ______ should be checked to ensure that the proper distance is maintained between the ______ .
ball gaps, ball gap spheres
Each ungrounded tower is provided with a _______ (with or without a rain shield) for installation across the base insulator.
ball gap lightning protector
The ball gaps for the isolation transformers should be set ________ than the base insulator ball gap distance.
one-eighth of an inch greater
The ball gaps for the isolation transformers should be set ________ than the base insulator ball gap distance.
one-eighth of an inch greater
This is a picture of what?
Typical "z-feed" used at a LORAN Station
This is one type of what?
A corona ring, in place on a strucural guy
This is what kind of insulator?
Closed end johnny ball insulator
this is what kind of insulator?
Open end johnny ball insulator
this is what kind of insulator?
Open end johnny ball insulator
This is what kind of insulator?
Oil-filled multiple cylinder base insulator
what is this?
Typical ladder safety climbing device (Saf-T-Climb)