J-17_Excerpt_ZMP_RCLR_ID01922_Tower Assessment Report_2024_DNC.pdf
PDF 623 KB Posted
- Attached to
- Solicitation for multiple projects located at Air Route Traffic Control Center in Minneapolis, MN
- Solicitation number
- 697DCK-25-R-00354
About this file
This document is a National NASET Assessment Program Structural Assessment Report for a Federal Aviation Administration (FAA) tower located in Farmington, Minnesota. The assessment, conducted on 07/25/2024, reveals critical and moderate findings for a self-supporting, coated steel-galvanized tower with a height of 205 feet, constructed in 1989.
Key findings include two critical structural issues: a cracked/broken diagonal brace angle on face C at 170 ft and bent internal bracing at the tower's center section. A moderate finding involves the existing Ladder Safety System (LSS), which is a non-MSA Dyna-Glide system that does not meet FAA approval. The report recommends removing and replacing defective structural members, restricting tower access to Level 2 climbers, and replacing the current LSS with an MSA Dyna-Glide LSS. The tower's structural condition is rated as "Poor", and the next assessment is scheduled for 07/25/2029.
View the file
Other files
Show all 44
On GovTribe
Work with this file
- Download the original file
- Contacts named in this file
- Similar government files
- Ask GovTribe AI about this file
Text version
National NASET Assessment Program Structural Assessment Report
Assessment Date: ___________
Prepared for : Unstaffed Infrastructure Sustainment Program Office
Version Date: July 16, 2024
Federal Aviation Administration
Revision/Change Record
Section Modified on Author Changes/Reason
Make selections to customize form (unused sections will be removed)
Tower Type (configuration) Material Platform Fixed Ladder
Stairway Antennas, Mounts and Cables Lightning Protection
Note to Assessor:
If wrong selection is made, you must start over with a new template.
The use of the PDF Edit Feature is prohibited.
1.3 SUMMARY OF FINDINGS AND RECOMMENDATIONS
Critical Findings - Critical Finding is defined as one or more of the following:
a) Tower is declared “Do Not Climb”
b) High risk to public safety such as collapsing tower into public area
c) High risk of loss of facility service
# Category Description Recommendations Photo Number or N/A
1.3 SUMMARY OF FINDINGS AND RECOMMENDATIONS
Moderate Findings
# Category Description Recommendations
Photo Number or N/A
2.0 TOWER ASSESSMENT FORMS
2.0.1 UIS AD SUMMARY
LOC ID
Material Primary Facility
Tower Height (ft) Tower Shape
Year Constructed
Leased Tower?
Yes No
Structural Condition
SSC
Anchor Replacement Year (YYYY)
City
Assessment Date State
District
Recommended Restrictions
# Critical Exceptions As-found overall plumb ratio
0.0025
As-found overall twist (degrees)
Relative Baseplate Elevation (+/- feet)
Baseplate A Baseplate B Baseplate C
Baseplate D
There were no items observed that would prevent a climber from safely accessing and climbing the Tower.
It is recommended that the Ladder Safety System not be used and access to the tower be limited to Authorized Person Level II Climber Only.
It is recommended that access to the tower be limited to windspeeds below mph.
It is recommended that the tower be off limits to climbing. See recommended actions in the following sections.
Structure ID (Unique Number)
Description +
Tower Type (Configuration)
Tower Access
# Moderate Exception Overall plumb Ratio after adjustments
Overall twist after adjustments (degrees)
# Minor Exceptions
Tower # or Stationing
Target maximum plumb ratio
Target Overall maximum twist (degrees)
Co-located Facility #1
Co-located Facility #2
Co-located Facility #3
Co-located Facility #4 Co-located Facility #5 Co-located Facility #6
Co-located Facility #7
Co-located Facility #8
Service Area
0.005 for monopoles
(MM/DD/YYYY)
(MM/DD/YYYY)Proposed Next Assessment Date
CORROSION DESCRIPTION REFERENCES
Please describe the severity of rust/corrosion on any tower component in terms of degree: 1st, 2nd or 3rd, and in terms of importance: priority 1, priority 2 or priority 3. The criteria for these are as follows:
1st Degree:
2nd Degree:
3rd Degree:
light surface corrosion exhibiting a chalky discoloration of the substrate moderate corrosion with evidence of pitting and breakdown of the galvanized coating material severe corrosion causing flaking and deformity of the substrate with loss of protective coating.
Critical:
Moderate:
2nd or 3rd degree of corrosion on component that may have immediate impact on structural integrity or personal safety.
2nd or 3rd degree of corrosion that does not impose an immediate concern, but should be corrected when possible.
Minor: 1st or 2nd degree of corrosion that is wide spread or that affect minor components that can be easily replaced.
> PLATFORM PART LOCATION REFERENCES
Locations referred to in the survey report are interpreted as follows:
> Reference "A" will start with the northernmost Leg or Face. Faces and Legs are labeled with Face first, then leg, i.e. Face A then Leg A.
Rest to follow suit in a clockwise manner.
> Platform sections will be numbered starting with one at first complete section closest to ground. Label any half sections at the foundation level as "O".
> Section panels shall be numbered starting with one at lowest elevation.
> Braces shall be label according to their location, i.e. top right, top left, bottom right, bottom left.
NORTH
FACE A
LEG D LEGA
FACED FACE 8
LEGC LEG 8
FACEC
2.0.24 LADDER SAFETY SYSTEM (LSS)
# Description (See JO 3900-63 for additional information) Yes No 📷
Is an LSS present?
Comments:
Is the LSS manufacturer MSA Dyna-Glide?
Comments:
Does the LSS start between 30” and 48” above grade?
Comments:
Does the LSS extend at least 42” above the platform?
Comments:
N/A
Is a pivot davit present? If Yes, provide condition and functionality. If No, recommend that one be installed.
Comments:
6 Additional Comments:
| facility_ident_type_id: ZMP RCLR Tower ID 01922 |
| facility_city_state: Farmington, Minnesota |
| prepared_dt: 07/25/2024 |
| facility_photo: |
| revision_record: |
| section_0: |
| modify_0: |
| author_0: |
| reason_0: |
| section_1: |
| modify_1: |
| author_1: |
| reason_1: |
| section_2: |
| modify_2: |
| author_2: |
| reason_2: |
| section_3: |
| modify_3: |
| author_3: |
| reason_3: |
| section_4: |
| modify_4: |
| author_4: |
| reason_4: |
| tower_type_selection: [2] |
| material_type_selection: [Coated Steel-Galvanized] |
| platform_selection: [No] |
| fixed_ladder_selection: [Yes] |
| assessment: |
| material_type_other_1: |
| tower_number: 01922 |
| name: [Tower] |
| number: [1] |
| stationing: |
| colocated_facility: |
| 0: |
| 1: |
| 2: |
| 3: |
| 4: |
| 5: |
| 6: |
| 7: |
| tower_type: Self-Supporting |
| loc_id: ZMP |
| material_type: Coated Steel - Galvanized |
| primary_facility: RCLR |
| material_type_other: |
| tower_height: 205 |
| tower_shape: [Square Pyramid Base w/ Shaft Top] |
| year_constructed: 1989 |
| leased_tower_q: N |
| structural_condition: [Poor] |
| ssc: Minneapolis ARTCC |
| anchor_replacement_dt: |
| anchor_replacement_chk_na: Off |
| anchor_replacement_lbl_na: N/A |
| city: Farmington |
| assessment_dt: 07/25/2024 |
| state: [Minnesota] |
| next_assessment_dt: 7/25/2029 |
| district: Minneapolis |
| service_area: [1] |
| access_restriction_0: Off |
| access_restriction_1: Off |
| access_restriction_2: Off |
| windspeeds: |
| access_restriction_3: Yes |
| plumb_ratio: 0.0008 |
| plumb_adjustments: 0.0008 |
| twist_degrees: -0.6659 |
| twist_adjustments: -0.6659 |
| baseplate_a: 3.3359 |
| baseplate_b: 3.3593 |
| baseplate_c: 3.3511 |
| baseplate_d: 3.3521 |
| stairway_selection: [No] |
| antennas_mounts_coaxial_cables_selection: [Yes] |
| lightning_protection_selection: [Yes] |
| critical_category: |
| 0: STRUCTURAL MEMBERS AND CONNECTIONS - METAL |
| 1: STRUCTURAL MEMBERS AND CONNECTIONS - METAL |
| 2: |
| 3: |
| 4: |
| critical_description: |
| 0: Tower diagonal brace angle is cracked/broken on face C at 170 ft. |
| 1: Tower internal bracing is bent at the center of the tower, at section 11. |
| 2: |
| 3: |
| 4: |
| critical_recommend: |
| 0: Post DNC sign. Remove defective member and replace as soon as possible with the same member size, shape, length, and protecting coating. Follow established procedures for removal of structural members. |
| 1: Post DNC sign. Remove defective member and replace as soon as possible with the same member size, shape, length, and protecting coating. Follow established procedures for removal of structural members. |
| 2: |
| 3: |
| 4: |
| critical_photo: |
| 0: 7 |
| 1: 8 |
| 2: |
| 3: |
| 4: |
| moderate_category: |
| 0: LADDER SAFETY SYSTEM (LSS) |
| 1: |
| 2: |
| 3: |
| 4: |
| 5: |
| 6: |
| 7: |
| 8: |
| 9: |
| moderate_description: |
| 0: LSS is not FAA-approved. |
| 1: |
| 2: |
| 3: |
| 4: |
| 5: |
| 6: |
| 7: |
| 8: |
| 9: |
| moderate_recommend: |
| 0: Replace with MSA Dyna-Glide LSS. Restrict to Level 2 climbers until replacement. |
| 1: |
| 2: |
| 3: |
| 4: |
| 5: |
| 6: |
| 7: |
| 8: |
| 9: |
| moderate_photo: |
| 0: 9 |
| 1: |
| 2: |
| 3: |
| 4: |
| 5: |
| 6: |
| 7: |
| 8: |
| 9: |
| critical_number: 2 |
| moderate_number: 1 |
| minor_number: 28 |
| lss: |
| question_1: Y |
| photo_1: 9 |
| comment_1: [Existing LSS is Turris RAM Rail and is not a MSA Dyna-Glide LSS. ] |
| question_2: N |
| photo_2: 9 |
| comment_2: [Minor – LSS is a non-MSA Dyna-Glide LSS.] |
| question_3: Y |
| photo_3: |
| comment_3: [LSS start height measures at 33".] |
| question_4: NA |
| photo_4: |
| comment_4: [ ] |
| question_5: N |
| photo_5: N/A |
| comment_5: Pivot davit is absent. No action is required. |
| additional_notes: |
btn_attach_pdf_6:
File details come from the government source that posted it. Updated .