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Page 1 of 12 Input No. 62-NFPA 409-2013 [ Section No. 3.3.9 ] 3.3.9 Hangar Building Cluster. A group of buildings with more than one area for the storage and servicing of aircraft and all attached or contiguous structures, or structures not separated as specified in 8.3.1 of this standard, as appropriate. Submittal Date: Mon Aug 19 17:43:53 EDT 2013 This Input proposes to delete the definition of "Hangar Building Clusters", in conjunction with the revisions proposed in CI 61 (Chapter 8). There is sufficient confusion and uncertainty in the application of the standard to Group III hangars that this proposal is presented for public review. The concepts of hangar clusters and row hangars tend to cause confusion. In order to simplify this chapter, the committee is considering whether aircraft storage and servicing areas that are adequately separated by internal or external partitions should be considered independently of other nearby spaces and in accordance with the locally adopted building code.

Page 2 of 12 Input No. 27-NFPA 409-2013 [ Section No. 3.3.15 ] 3.3.15 * Unfueled Aircraft. An aircraft whose fuel system has had flammable or combustible liquid removed such that no tank, cell, or piping contains more than one-half of 1 percent of its volumetric capacity. Supplemental Information File Name CI27_Annex.docx Description Submittal Date: Thu Aug 15 14:19:56 EDT 2013 Add new annex material to explain the intent of the definition for Unfueled Aircraft and the extent to which an aircraft must be drained in order to qualify under the definition. See attached.

Page 3 of 12 Input No. 29-NFPA 409-2013 [ Section No. 5.2.1 ] 5.2.1* Where aircraft storage and servicing areas are subdivided into separate fire areas, the separation shall be by a fire wall barrier having not less than a 3 2 -hour fire resistance rating. Any openings in such fire walls barriers communicating directly between two aircraft storage and servicing areas shall be provided with a listed 3 2 -hour fire door or 3 2 -hour shutter actuated from both sides of the wall. Where areas are of different heights, the tallest wall shall have a fire resistance rating of not less than 3 2 hours. Submittal Date: Thu Aug 15 15:30:16 EDT 2013 The committee believes that a 2-hour fire barrier could be sufficient to permit the fire protection systems to control or suppress a fire. Public comment is sought.

Page 4 of 12 Input No. 57-NFPA 409-2013 [ Section No. 6.2.10.7 ] 6.2.10.7 * Water Reservoirs. Where a single reservoir is used for the basic water supply, such reservoir shall be divided into approximately equal sections, arranged so that at least one-half of the water supply will always be maintained in service in order to increase the reliability of the water supply. The suction line from each section shall be sized to deliver the maximum water supply requirement. Supplemental Information File Name CI57_Annex.docx Description Submittal Date: Mon Aug 19 14:56:14 EDT 2013 This Input proposes to delete 6.2.10.7 and to move the associated annex material to A.6.2.10 with revisions per the attached document. The committee would like to receive public comment on this proposal, which would reduce the minimum level of reliability for singlereservoir water supplies. The committee seeks to consider whether such provisions should be voluntary or should be considered as minimum requirements.

Page 5 of 12 Input No. 40-NFPA 409-2013 [ Section No. 6.2.10.8.2 ] A. 6.2.10.8.2 The total pumping capacity shall should be such that the maximum demand is met with the largest fire pump out of service. Submittal Date: Mon Aug 19 11:30:51 EDT 2013 This Input proposes to move the text to the annex and to convert the requirement for a redundant pump into a recommendation. The committee would like to receive public comment on this proposal, which would reduce the minimum level of reliability for fire pumps. The committee seeks to consider whether such provisions should be voluntary or should be considered as minimum requirements. See also FR 41, which relaxes the existing requirement.

Page 6 of 12 Input No. 61-NFPA 409-2013 [ Sections 8.1, 8.2, 8.3 ] Sections 8.1, 8.2, 8.3 8.1 Construction. 8.1.1* Group III hangars shall be constructed of any of the types of construction specified in NFPA 220. 8.1.2 Group III hangars aircraft storage and servicing areas shall be limited to one story. 8.1.2.1 Where a Group III hangar as defined in 4.1.3 and 4.1.4 aircraft storage and servicing area exceeds one story, the hangar shall be designated as a Group II hangar. 8.1.3 The surface of the grade floor of aircraft storage and servicing areas, regardless of type of hangar construction, shall be noncombustible and above the grade of the approach or apron at the entrance to the hangar. 8.1.4 Hangar aprons shall slope away from the level of the hangar floors to prevent liquid on the apron surfaces from flowing into the hangars. 8.1.5 In hangar building clusters and in row hangars, a minimum of 15 cm (6 in.) high curbing shall be provided between each aircraft space to prevent the flow of liquid from one space to adjacent spaces. 8.1.5.1 Group III hangars protected with the fire protection specified in Chapter 7 shall be provided with floor drainage in accordance with Section 5.11. 8.1.6* Roof coverings shall be listed as Class C or better. 8.1.7 Exposed interior insulation attached to walls and roofs in an aircraft storage or servicing area of a hangar shall comply with the special provisions for aircraft storage hangars, interior wall and ceiling finish criteria of NFPA 101. 8.2 Separation and Internal Subdivisions. 8.2.1 For single hangar buildings, the clear-space distances specified in Table 8.2.1 shall be maintained on all sides of the single hangar. Where mixed types of construction are involved, the less fire-resistant type of construction shall be used to determine the clear space required. Where the minimum clear spaces specified in Table 8.2.1 are not met, the buildings shall be classified as a hangar building cluster. Table 8.2.1 Clear-Space Distances for Single Hangar Buildings

Page 7 of 12 8.3.1 Minimum Separation Required Type of Construction m ft Type I (443) and (332) 15 50 Type II (222) 15 50 Type II (111), Type III (211), and Type IV (2HH) 15 50 Type II (000) 15 50 Type III (200) 15 50 Type V (111) and (000) 23 75 8.2.1.1 Where single hangar buildings adjoin each other and each has fire walls with a minimum rating of at least 2 hours, located so that fire areas shall not exceed the maximum areas specified in Table 4.1.3, no minimum separation distance shall be required. These buildings shall not be classified as a hangar building cluster. 8.2.2 Row hangars shall be divided by solid partitions having a fire resistance that meets or exceeds the exterior walls or roof, whichever is greater, so that no more than three aircraft spaces shall be within an enclosed area. 8.2.3 Partitions and ceilings separating aircraft storage and servicing areas from other areas, such as shops, offices, and parts storage areas, shall have at least a 1-hour fire resistance rating with openings protected by listed fire doors having a fire resistance rating of at least 45 minutes. 8.3 Hangar Building Clusters. In hangar building clusters, Group III hangars within a cluster shall be limited in total area for the specific types of construction in accordance with Table 8.3.1. Where mixed types of construction are involved, the less fire-resistant type of construction shall be used to determine the maximum allowable area in accordance with the table. Table 8.3.1 Maximum Fire Areas for Hangar Building Clusters Maximum Total Fire Area Types of Construction m 2 ft 2 Type I (443) and (332) 5,574 60,000 Type II (222) 3,716 40,000 Type II (111), Type III (211), and Type IV (2HH) 2,787 30,000 Type II (000) 2,230 24,000 Type III (200) 2,230 24,000 Type V (111) 1,486 16,000 Type V (000) 929 10,000 8.3.2 Where the total area of all Group III hangars in a cluster exceeds that specified in Table 8.3.1, selected buildings in the hangar cluster shall be classified as Group II hangars and protected in accordance with Chapter 7 of this standard. These buildings shall be selected such that the total area of the unprotected Group III hangar buildings in the hangar cluster is below the maximum area allowed by Table 8.3.1 for the less fire-resistant type of construction. 8.3.3 For hangar building clusters, the clear-space distances specified in Table 8.3.3 shall be maintained on all sides of the hangar building clusters. Where mixed types of construction are involved, a less fire-resistant type of construction shall be used. Table 8.3.3 Clear-Space Distances for Hangar Building Clusters Minimum

Page 8 of 12 Separation Required Type of Construction m ft Type I (433) and (332) 23 75 Type II (222) 23 75 Type IV (2HH) 23 75 Type II (111) and Type III (211) 30 100 Type II (000) 30 100 Type III (200) 30 100 Type V (111) and (000) 38 125 Submittal Date: Mon Aug 19 17:22:38 EDT 2013 This Input proposes to significantly revise the requirements of Chapter 8. There is sufficient confusion and uncertainty in the application of the standard to Group III hangars that this proposal is presented for public review. The concepts of hangar clusters and row hangars tend to cause confusion. In order to simplify this chapter, the committee is considering whether aircraft storage and servicing areas that are adequately separated by internal or external partitions should be considered independently of other nearby spaces and in accordance with the locally adopted building code. See also CI 62 (3.3.9). Public Input No. 2-NFPA 409-2012 [Section No. A.3.3.2]

Page 9 of 12 Input No. 59-NFPA 409-2013 [ Section No. 9.14.12.5 ] A. 9.14.12.5 Water Reservoirs. Where a single reservoir is used for the basic water supply, such reservoir shall should be divided into approximately equal sections, arranged so that at least one-half of the water supply will always be maintained in service in order to increase the reliability of the water supply. The suction line from each section shall should be sized to deliver the maximum water supply requirement. Submittal Date: Mon Aug 19 15:21:15 EDT 2013 This Input proposes to move the text to the annex for 9.14.12 and to change "shall" to "should" in two places. The committee would like to receive public comment on this proposal, which would reduce the minimum level of reliability for single-reservoir water supplies. The committee seeks to consider whether such provisions should be voluntary or should be considered as minimum requirements.

Page 10 of 12 Input No. 53-NFPA 409-2013 [ Section No. 9.14.13.2 ] A. 9.14.13.2 The total pumping capacity shall should be such that maximum demand shall be met with the largest fire pump out of service. Submittal Date: Mon Aug 19 14:43:23 EDT 2013 This Input proposes to move the text to the annex and to convert the requirement for a redundant pump into a recommendation. The committee would like to receive public comment on this proposal, which would reduce the minimum level of reliability for fire pumps. The committee seeks to consider whether such provisions should be voluntary or should be considered as minimum requirements. See also FR 54, which relaxes the existing requirement.

Page 11 of 12 Input No. 60-NFPA 409-2013 [ Chapter 11 ] Chapter 11 Periodic Inspection and Testing 11.1 Fire Protection Systems. 11.1.1 Inspection and testing of fire protection systems in aircraft hangars shall be performed in accordance with NFPA 25 as modified by Table 11.1.1. Table 11.1.1 Inspection and Testing of Hangar Fire Protection Systems Type and Frequency of Inspections and Tests System Components Weekly Monthly SemiannuallyAnnuallyQuarterlyEvery 5 YearsSprinklerheads V Piping V DPipe hangers V Sprinkler alarm valve V O 1 Deluge valve V O D Shutoff valves V F Fire pumps F 2 D Waterreservoirs V Hose stations V DStrainers V Foam concentrate F Concentrate storage tanks V ConcentratepumpF 2 O D Concentrate control valve (automatic) V O D Concentrate shutoff valve V F Foam proportioning device V D Waterpowered monitor nozzle V D Electric-powered manual nozzle V F D Water-powered high-expansion-foam (HEF) generator V O D Electric-powered high-expansion-foam (HEF) generator V F D Pneumatic detector F O 3 Electricdetector FO 3 Optical detector V F O 3 Control panels V F O Alarm transmission (local and remote) F Tamper switch F Flow indication switch O Supervisoryalarms F Manual actuation stations F Hangar floor drain system and separators V DFire doors V F Gas detectors VF Ventilation system in pits, tunnels, andducts F Grounding equipment F V: Visual inspection. D: Operational test with actual discharge. O: Operational test with flow, no discharge. F: Functional test, no flow. 1 For the purposes of this test, the inspector s flow valve is acceptable. 2 Churn test. 3 At this time it is necessary to check that the set points are the same as the original. *****INSERT NEW TABLE 11.1.1 PER ATTACHED***** 11.1.2 All preprimed closed-head AFFF systems shall be drained, flushed, and reprimed annually. 11.1.3 Records of inspections, tests, and test results shall be maintained. Supplemental Information File Name CI60_Table11.1.1.docx Description

Page 12 of 12 Submittal Date: Mon Aug 19 15:54:33 EDT 2013 This Input proposes to significantly revise Chapter 11. The committee has formed a task group to better define the inspection and maintenance requirements of fire protection systems in hangars, since many of these systems are not within the scope of NFPA 25. This proposal is provided as a baseline to seek public comment on the subject. The section references in the revised table are based on the following documents: NFPA 25, 2011 Edition; NFPA 11, 2010 Edition; NFPA 72, 2010 Edition; NFPA 80, 2010 Edition; NFPA 90A, 2009 Edition; NFPA 1962, 2008 Edition; NFPA 33, 2007 Edition; Air Force Instruction AFI 32-1065, Grounding Systems, October 1998. Public Input No. 69-NFPA 409-2013 [Chapter 11 [Title Only]]

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