Evidence
11 evidence entries recorded; each entry has a stable permalink (#ev-1 … #ev-11).
-
[1]research packet 899-packet.md [other_primary]
- Finding type
- vessel_history
- Finding
- Identity packet verdict: PHANTOM (never commissioned)
- Verification
- verified
- Role
- negative_finding
- Documentation level
- ship_specific
- Evidence ID
- uss-pc-506-pc506-pkt-899-packet-md
-
[2]DANFS / NHHC compiled entry 'SC-501 - SC-600' (official U.S. Navy history page; verified live 2026-10-03) [nhhc_danfs]
- Locator
- DANFS 'SC-501 - SC-600' page, SC-506 entry
- Finding type
- vessel_history
- Finding
- Official milestone record for this hull: 'SC-506 - Built at Luders Marine Const. Co., Stamford, Conn. Keel laid 3/24/41. Launched 1/30/42. Commissioned 4/30/42. Transferred to France 9/27/44.' The compiled entry is indexed under the SC designation the hull carried from April 1943; it commissioned as PC-506 (see ev-02).
- Verification
- verified
- Role
- context
- Documentation level
- ship_specific
- Accessed
- 2026-10-03
- Study period
- 1941-1944
- Population
- Luders Marine construction trades (1941-42); U.S. Navy crew (1942-44)
- Limitations
- Ship-specific milestones only; the compiled SC-501-SC-600 entries are bare-bones (builder, keel, launch, commission, disposal) with no service narrative, no complement/spec block, and no material or asbestos content. NHHC confirms no fuller DANFS history exists for this hull (NavSource: 'There is no DANFS history available for PC-506').
- Atlas source
- true
- Evidence ID
- ev-uss-pc-506-pc506-01
-
[3]Annual Report of the Secretary of the Navy, FY1941 (NHHC Online Reading Room) - 'Ships under construction - Private yards' table, SUBMARINE CHASERS block, as of 30 June 1941; cross-checked against NavSource SC-506 archive record and NHHC DANFS compiled entry [other_primary]
- Locator
- SecNav FY1941 report, 'Ships under construction - Private yards - Continued (As of June 30, 1941)', SUBMARINE CHASERS table, row PC506; NavSource 12/150506 designation line; DANFS SC-501-SC-600 builder attributions
- Finding type
- historical_record
- Finding
- CORRECTION: the hull number PC-506 was never a PC-461-class (173-foot, steel-hulled) patrol craft. The SecNav FY1941 report lists 'PC506' under the SUBMARINE CHASERS heading at Luders Marine Construction Co. as of 30 June 1941 - the Navy booked the hull as a 110-foot subchaser from contract. The same PC-numbered block maps one-for-one onto SC-497-class hulls by builder: PC-501/PC-502 (Seabrook Yacht) -> SC-501/SC-502; PC-503/PC-504 (Rice Brothers) -> SC-503/SC-504; PC-505/PC-506 (Luders Marine) -> SC-505/SC-506; PC-507/PC-508 (Mathis Yacht) -> SC-507/SC-508; PC-511/PC-512 (American Cruiser) -> SC-511/SC-512; PC-513/PC-514 (Quincy Adams) -> SC-513/SC-514. PC-506 commissioned under its PC number on 30 April 1942 and was reclassified SC-506 in April 1943 (NavSource). The database manifest's PC-461 classing is corrected to SC-497 class.
- Verification
- verified
- Role
- correction
- Documentation level
- ship_specific
- Accessed
- 2026-10-03
- Study period
- 1941-1943
- Limitations
- Corrects a class/designation error, not a material claim. The SecNav table proves the hull was contracted as a submarine chaser under the PC number block; NavSource supplies the April 1943 reclassification date (month only - exact date not located). No asbestos content.
- Atlas source
- true
- Evidence ID
- ev-uss-pc-506-pc506-02
-
[4]NavSource Online: Submarine Chaser Photo Archive, SC-506 ex-PC-506 (archive 12/150506) - designation timeline, full specification block, photographic record (verified live 2026-10-03) [other_primary]
- Locator
- NavSource 12/150506 header block (SC-506 ex-PC-506), timeline, and specifications block
- Finding type
- vessel_history
- Finding
- NavSource record for this hull: laid down 24 March 1941 by Luders Marine Construction Co., Stamford, CT; launched 30 January 1942; commissioned USS PC-506, 30 April 1942; reclassified SC-506 in April 1943; transferred to France 27 September 1944 and reclassified CH-113; fate unknown. Served the navies of the United States and France; call sign Nan-Uncle-Peter-Uncle (NUPU). Specifications: displacement 148 t.; length 110'10"; beam 17'; draft 6'6"; speed 15.6 kts.; complement 28; armament one 40mm mount, two .50-cal. machine guns, two depth-charge projector 'Y Guns,' and two depth-charge tracks; propulsion two 880-bhp General Motors 8-268A diesel engines, Snow and Knobstedt single reduction gear, two shafts. Page states 'There is no DANFS history available for PC-506.'
- Verification
- verified
- Role
- context
- Documentation level
- ship_specific
- Accessed
- 2026-10-03
- Study period
- 1941-1951
- Population
- Luders Marine construction trades (1941-42); U.S. Navy crew cpl. 28 (1942-44); French Navy crew (1944-51)
- Limitations
- NavSource is a volunteer secondary compilation, not a primary registry - milestones here agree with NHHC DANFS and uboat.net. 'Fate unknown' means no documented post-transfer disposal. Contains no asbestos content. navsource.org addresses are dead - the live domain is navsource.net.
- Atlas source
- true
- Evidence ID
- ev-uss-pc-506-pc506-03
-
[5]uboat.net Allied Warships of WWII, USS SC-506 (SC-506) warship file no. 8812 - order date, milestone table, commanding officer; class page 464 (verified live 2026-10-03) [other_primary]
- Locator
- uboat.net/allies/warships/8812.html technical block and 'Commands listed' table
- Finding type
- vessel_history
- Finding
- uboat.net warship file for this hull: SC-497 class; built by Luders Marine Construction Co. (Stamford, CT); ordered 14 January 1941; laid down 24 March 1941; launched 30 January 1942; commissioned 30 April 1942; end of U.S. service 27 September 1944; 'Transferred to France on 27 September 1944 being renamed CH-113.' Command listed: Murdock Moore Maxwell, USNR, from 30 April 1942 (commissioning CO). The 'ordered' date is the only milestone source giving 14 January 1941.
- Verification
- partial
- Role
- context
- Documentation level
- ship_specific
- Accessed
- 2026-10-03
- Study period
- 1941-1944
- Population
- Lt. Murdock Moore Maxwell, USNR, and commissioning crew (1942)
- Limitations
- uboat.net is a specialist secondary compilation (Allied Warships section); milestone dates corroborate NHHC/NavSource but the order date and CO listing are not independently confirmed against a primary document. No asbestos content.
- Atlas source
- true
- Evidence ID
- ev-uss-pc-506-pc506-04
-
[6]Marines de Guerre et Poste Navale (French naval postal-history association), vessel fiche '* CHASSEUR CH 113 (1944/1951)' - French-service record (verified live 2026-10-03) [other_primary]
- Locator
- postenavalemilitaire.com topic t5819, CH 113 HISTORIQUE / CARACTERISTIQUES block
- Finding type
- vessel_history
- Finding
- French-service record for the transferred hull: 'Chasseur de Sous-marins de l'U.S Navy SC-506, transfere a la Royale en septembre 1944.' Type SC-497; hull symbol CH 113; mis en service 27 septembre 1944; desarme 06 janvier 1951. French-side specs: 110 tonnes, 33.70 m, maitre-bau 5.70 m, tirant d'eau 2 m, 1,000 cv, 15.60 noeuds, equipage 28 hommes, armement 1 x 40 mm + 3 x 20 mm.
- Verification
- partial
- Role
- context
- Documentation level
- ship_specific
- Accessed
- 2026-10-03
- Study period
- 1944-1951
- Population
- French Navy crew (1944-1951)
- Limitations
- Association/hobbyist postal-history compilation, not a French Navy archival record - the 1951-01-06 desarmement date is the only located French disposition and rests on this single secondary source. The fiche's 'Autre nom: SC-517 (U.S Navy)' is internally inconsistent with its own 'SC-506' identification and is treated as a compilation error (see gaps). Post-1951 fate unrecorded - NavSource 'fate unknown' stands. No asbestos content.
- Atlas source
- true
- Evidence ID
- ev-uss-pc-506-pc506-05
-
[7]Library of Congress, Prints & Photographs, item 2017693751 / LC-USE6-D-006114 (digital ID fsa 8b07434), Howard Liberman / Office of War Information, March 1942 - 'A new American subchaser ... is commissioned at an Eastern boatyard ... Marine Construction Company, Stamford, Connecticut' [other_primary]
- Locator
- loc.gov item 2017693751; call number LC-USE6- D-006114 [P&P] LOT 2144; NavSource 12/150506 photo table
- Finding type
- historical_record
- Finding
- Library of Congress holds an Office of War Information photograph (Howard Liberman, March 1942) of a newly built submarine chaser at Marine Construction Company, Stamford, Connecticut - the Luders Marine yard - with the original OWI caption 'Another worry for the U-boats. A new American subchaser that will hound the undersea craft of the Axis is commissioned at an Eastern boatyard. Target boats are moored alongside.' NavSource carries this image (LC-USE6-D-006114) as this hull's portrait, c. 1942.
- Verification
- partial
- Role
- archival_lead
- Documentation level
- ship_specific
- Accessed
- 2026-10-03
- Study period
- 1942-03
- Limitations
- Archival lead: the LOC caption names the yard and date (March 1942) but does NOT name the hull - identification as PC-506 is NavSource's attribution, consistent with the timeline (launched 30 Jan 1942, fitting out into April) but not caption-verified. Direct HTML fetch returns 403 to non-browser clients; record verified via the loc.gov JSON API (fo=json) 2026-10-03. No asbestos content.
- Atlas source
- true
- Evidence ID
- ev-uss-pc-506-pc506-06
-
[8]NavSource Submarine Chaser (SC) index - SC-497-class program summary; Patrol Craft Sailors Association (ww2pcsa.org) class specifications for the 110-foot wood-hull SC and the contrasting 173-foot steel PC-461 class [other_primary]
- Locator
- NavSource 12/15idx.htm class header; ww2pcsa.org/subchaser.html and /patrol-craft.html spec blocks
- Finding type
- historical_record
- Finding
- Class context for the SC-497 type this hull was actually built to: 'Five hundred eighty SC-497 Class wood-hulled, 110-foot Submarine Chasers (SC) were built during World War II, with 142 of these being used by our Allies under the Lend-Lease Program' (NavSource SC index; designed for off-shore patrol and anti-submarine warfare on the Atlantic seaboard). PCSA class specs: 110'10" x 17'11.5", 98 t., two 1,200-bhp straight-8s or GM 'pancake' diesels, 19 kts., complement 3 officers + 25 enlisted, 438 delivered of 475 ordered, 50 to France under Lend-Lease. Contrast - the PC-461 class the manifest's designation implied: 173'8" x 23' steel hull, 284 t., two 2,000-bhp diesels, 5 officers + 60 enlisted (PCSA).
- Verification
- verified
- Role
- context
- Documentation level
- class_or_era
- Accessed
- 2026-10-03
- Study period
- 1941-1945
- Population
- SC-497-class crews and builders (class context)
- Limitations
- Class-level data only - does not document this hull's outfit or service. Program totals conflict across compilations (NavSource 580 built vs PCSA 438 delivered vs uboat.net 443 class members) - see gaps; the difference is counting scope (foreign orders/cancellations). No asbestos content.
- Atlas source
- true
- Evidence ID
- ev-uss-pc-506-pc506-07
-
[9]Era inference built on: NHHC DANFS milestones (1941-42 construction, Luders Marine); NavSource specifications (wood hull class, 2 x GM 8-268A diesels, no steam plant); NavSource SC index ('wood-hulled, 110-foot'); PCSA class specs; GAO HRD-80-2 Navy asbestos-program context (ev-09) [other_primary]
- Locator
- NavSource 12/150506 specifications; NavSource 12/15idx.htm class header; GAO HRD-80-2 (program context)
- Finding type
- asbestos_application
- Finding
- Asbestos-relevant assessment for the type: a wood-hulled, diesel-engined submarine chaser built 1941-42 sits inside the Navy's documented asbestos-use era, but the exposure pathways are narrower than for steel steam combatants. No steam plant - the boiler/steam-line lagging pathway does not apply. Wooden hull construction carries none of the steel-ship hull-insulation practice. Remaining era-standard applications for a small diesel combatant of this period: diesel exhaust insulation/lagging in the confined engine space, engine and machinery gaskets and packing, and electrical insulation.
- Verification
- inferred
- Role
- supporting
- Documentation level
- class_or_era
- Accessed
- 2026-10-03
- Study period
- 1941-1951
- Population
- Luders Marine construction trades (1941-42); U.S. Navy engine-room and deck crew (1942-44); French Navy crew (1944-51); any disposal/breaking crew post-1951
- Limitations
- Class/era inference only - no hull-specific insulation survey, material list, work package, or product identification located for PC-506/SC-506/CH-113. Names era-standard application categories, not confirmed installed materials. No quantity. The wooden hull and diesel plant materially narrow the inference relative to a steel steam vessel; absence of a steam pathway is design fact, absence of any asbestos aboard is not established.
- Atlas source
- true
- Evidence ID
- ev-uss-pc-506-pc506-08
-
[10]GAO, Navy Efforts To Protect Workers From Asbestos Exposure, HRD-80-2 (Oct 18, 1979) [gao]
- Locator
- GAO product page HRD-80-2 (full text blocked to automated fetch)
- Finding type
- gov_survey
- Finding
- GAO documented that the Navy used asbestos insulation extensively aboard ships and did not begin substituting alternative insulation materials until the early 1970s - spanning this hull's construction (1941-42) and entire U.S. service period (1942-44).
- Verification
- verified
- Role
- context
- Documentation level
- class_or_era
- Accessed
- 2026-10-03
- Study period
- 1979 (report); wartime construction era
- Population
- Navy shipyard workers and crews (program context)
- Limitations
- Program-level documentation; supports era context only, not any fact specific to this hull. Full text not retrieved (gao.gov blocks automated fetch, HTTP 403 - standing limitation confirmed in prior batches); content via product-page description.
- Atlas source
- true
- Evidence ID
- ev-uss-pc-506-pc506-09
-
[11]Batch-7881 search ledger (this record): NHHC DANFS compiled entry; SecNav FY1941 report; NavSource ship and class pages; uboat.net warship file and class page; LOC JSON API; French postal-naval fiche; NVR; navalmarinearchive Luders yard table; PCSA; general-web litigation sweep; CourtListener (blocked - fleet pacing) [other_primary]
- Locator
- search_ledger rows sl-uss-pc-506-pc506-01 through -16
- Finding type
- historical_record
- Finding
- No qualifying ship-specific asbestos record located: no asbestos survey, abatement contract, hazmat disclosure, or verified litigation naming PC-506 / SC-506 / CH-113 was found in the public sources searched (see search_ledger). General-web sweeps surfaced only name collisions (patent compounds, bill numbers) and excluded law-firm marketing pages listing builder 'Luders Marine Construction' on Connecticut jobsite lists - none name this hull. CAVEAT: CourtListener base queries could not be completed this session - the fleet pacing cap was momentarily spent on every attempt (helper-enforced ~58/hr shared limit); logged as blocked, not a negative result.
- Verification
- verified
- Role
- negative_finding
- Documentation level
- ship_specific
- Accessed
- 2026-10-03
- Study period
- 2026-10-03
- Limitations
- Absence of a located public record does not prove absence of asbestos aboard. The litigation repository search is a genuine open gap (paced, not run to completion). RG 24 deck logs and any Luders work packages are undigitized open leads. Does not establish or defeat any claim of exposure or legal eligibility.
- Atlas source
- true
- Evidence ID
- ev-uss-pc-506-pc506-10