# Service difficulty reports: N188DN A list on [N188DN](https://openairdocs.org/aircraft/N188DN.md). Matched to this aircraft by N-number and event date, checked against the reported serial number, make and model. Newest first. Page 1 of 8 · 352 reports - [SDR DALA2026051202963](https://openairdocs.org/sdr/DALA2026051202963.md): Adi · failed · May 10, 2026 · N188DN · Boeing 767332 · Central Display > CAPTAIN`S ADI WENT BLANK, NOTICED BURNING ODOR, PULLED CB, ODOR WENT AWAY. R & R CAPTAIN EADI PER B767-300 AMM 34-22-03 (8716356) (AIRCRAFT GROUNDED) - [SDR DALA2026043002744](https://openairdocs.org/sdr/DALA2026043002744.md): Heater · odor · Apr 29, 2026 · N188DN · Boeing 767332 · Doors > FLIGHT ATTENDANT REPORTS SMOKE AND FUME EVENT AFT RIGHT LAV AND CREW REST. REPLACED DOOR HEATER #3 REF B767 AMM 25-29. (8716316) (AIRCRAFT GROUNDED) - [SDR DALA2026032702046](https://openairdocs.org/sdr/DALA2026032702046.md): Spar Web · cracked · Mar 24, 2026 · N188DN · Boeing 767332 · Wing Spar > HFEC INSPECTION FOUND 01 EA CRACK AT TENSION BOLT HOLE, IT`S ON THE FRONT SPAR WEB AT THE 6 O`CLOCK POSITION. REPAIRED PER 632686-14AD. (1509512) - [SDR DALA2026032702045](https://openairdocs.org/sdr/DALA2026032702045.md): Fitting · cracked · Mar 24, 2026 · N188DN · Boeing 767332 · Wing Main, Frame Structure > HFEC INSPECTION FOUND 01 EA CRACK AT RH LOWER UNDER-WING LONGERON FITTING, REPLACEMENT OF THE LOWER RH UNDER- WING LONGERON FITTING IS REQUIRED IN ACCORDANCE WITH WORK CARD 5711-01042-04. 5711-01042-04 COMPLETED RT LOWER UNDER-WING LONGERON FITTING REPAIR. C - [SDR DALA2026032702044](https://openairdocs.org/sdr/DALA2026032702044.md): Fitting · cracked · Mar 24, 2026 · N188DN · Boeing 767332 · Wing Main, Frame Structure > HFEC INSPECTION FOUND 01 EA CRACK AT RH LOWER UNDER-WING LONGERON FITTING. COMPLETED RH LOWER UNDER-WING LONGERON FITTING REPAIR. (1509462) - [SDR DALA2026032401968](https://openairdocs.org/sdr/DALA2026032401968.md): Stringer · corroded · Mar 20, 2026 · N188DN · Boeing 767332 · Fuselage Main, Longeron/Stringer > FWD CARGO STRINGER FOUND CORROSION AT STA 786 S-35R REFER TO CPCP TASK 53-460-00. CORRECTIVE ACTION: REPAIRED AS PER B767-300 SRM 53-00-03. (1503014) - [SDR DALA2026031701823](https://openairdocs.org/sdr/DALA2026031701823.md): Door Frame · corroded · Mar 11, 2026 · N188DN · Boeing 767332 · Fuselage Main, Structure > FWD CARGO DOOR OUTER CHORD FOUND CORROSION AT STA 522 S-33R REFER TO CPCP TASK 53-460-00. THE DAMGE REPAIRED AS PER ER/A 632578-14. (1489235) - [SDR DALA2026031701813](https://openairdocs.org/sdr/DALA2026031701813.md): Seat Track · corroded · Mar 11, 2026 · N188DN · Boeing 767332 · Fuselage, Seat/Cargo Attach Fittings > FOUND SEAT TRACKS UPPER SURFACE CORROSION AT STA 1098.45-STA1443.85 RBL88.5. CORRECTIVE ACTION: THE DAMGE REPAIRED AS PER ER/A 632614-14. (1489138) - [SDR DALA2026031101692](https://openairdocs.org/sdr/DALA2026031101692.md): Floorbeam · corroded · Mar 11, 2026 · N188DN · Boeing 767332 · Fuselage Main, Floor Beam > SHIP 188 AFT CARGO FLOOR BEAM FOUND CORROSION AT STA 1197+88. CORRECTIVE ACTION: DAMAGED AREA REPAIRED PER B767-300 SRM53-00-07. (1489129) - [SDR DALA2026031101690](https://openairdocs.org/sdr/DALA2026031101690.md): Shear Tie · corroded · Mar 6, 2026 · N188DN · Boeing 767332 · Fuselage Internal Mounting Structure > SHIP 188 BULK CARGO SHEAR TIE FOUND CORROSION AT STA 1562 S- 38L TO S-38R. CORRECTIVE ACTION: DAMAGED AREA REPAIRED PER B767-300 SRM 51-40-02. (1481756) - [SDR DALA2026031101689](https://openairdocs.org/sdr/DALA2026031101689.md): Shear Tie · corroded · Mar 6, 2026 · N188DN · Boeing 767332 · Fuselage Internal Mounting Structure > SHIP 188 FWD CARGO SHEAR TIE FOUND CORROSION AT STA 654+44 S- 36L TO S-37L. CORRECTIVE ACTION: DAMAGED AREA REPAIRED PER B767-300 SRM 51-40-02. (1481749) - [SDR DALA2026031101688](https://openairdocs.org/sdr/DALA2026031101688.md): Shear Tie · corroded · Mar 6, 2026 · N188DN · Boeing 767332 · Fuselage Internal Mounting Structure > SHIP 188 AFT CARGO SHEAR TIE FOUND CORROSION AT STA 1197+132 S -39L TO S-38L. CORRECTIVE ACTION: DAMAGED AREA REPAIRED PER B767-300 SRM 51-40-02. (1481740) - [SDR DALA2026031101687](https://openairdocs.org/sdr/DALA2026031101687.md): Shear Tie · corroded · Mar 6, 2026 · N188DN · Boeing 767332 · Fuselage Internal Mounting Structure > SHIP 188 AFT CARGO SHEAR TIE FOUND CORROSION AT STA 1197+22 S- 39L TO S-38L. CORRECTIVE ACTION: DAMAGED AREA REPAIRED PER B767-300 SRM 51-40-02. (1481738) - [SDR DALA2026031101686](https://openairdocs.org/sdr/DALA2026031101686.md): Shear Tie · corroded · Mar 6, 2026 · N188DN · Boeing 767332 · Fuselage Internal Mounting Structure > SHIP 188 BULK CARGO SHEAR TIE FOUND CORROSION AT STA 1439 S- 39R TO S-38R. CORRECTIVE ACTION: DAMAGED AREA REPAIRED PER B767-300 SRM 51-40-02. (1481727) - [SDR DALA2026031101685](https://openairdocs.org/sdr/DALA2026031101685.md): Shear Tie · corroded · Mar 6, 2026 · N188DN · Boeing 767332 · Fuselage Internal Mounting Structure > SHIP 188 BULK CARGO SHEAR TIE FOUND CORROSION AT STA 1417 S- 37R TO S-38R REFER TO CPCP TASK 53-584-00. CORRECTIVE ACTION: DAMAGED AREA REPAIRED PER B767-300 SRM 51-40-02. (1481723) - [SDR DALA2026031101684](https://openairdocs.org/sdr/DALA2026031101684.md): Shear Tie · corroded · Mar 6, 2026 · N188DN · Boeing 767332 · Fuselage Internal Mounting Structure > SHIP 188 BULK CARGO SHEAR TIE FOUND CORROSION AT STA 1417 S- 39L TO S-39R. CORRECTIVE ACTION: DAMAGED AREA REPAIRED PER B767-300 SRM 51-40-02. (1481717) - [SDR DALA2026031101683](https://openairdocs.org/sdr/DALA2026031101683.md): Shear Tie · corroded · Mar 6, 2026 · N188DN · Boeing 767332 · Fuselage Internal Mounting Structure > SHIP 188 AFT CARGO SHEAR TIE FOUND CORROSION AT STA 1197+44 S- 37R TO S-36R, CORRECTIVE ACTION: DAMAGED AREA REPAIRED PER B767-300 SRM 51-40-02. (1481713) - [SDR DALA2026031101682](https://openairdocs.org/sdr/DALA2026031101682.md): Shear Tie · corroded · Mar 6, 2026 · N188DN · Boeing 767332 · Fuselage Internal Mounting Structure > SHIP 188 AFT CARGO SHEAR TIE FOUND CORROSION AT STA 1197+110 S -37L TO S-38L. CORRECTIVE ACTION: DAMAGED AREA REPAIRED PER B767-300 SRM 51-40-02. (1481707) - [SDR DALA2026031101681](https://openairdocs.org/sdr/DALA2026031101681.md): Shear Tie · corroded · Mar 6, 2026 · N188DN · Boeing 767332 · Fuselage Internal Mounting Structure > SHIP 188 FT CARGO SHEAR TIE FOUND CORROSION AT STA 1197+132 S -35L TO S-36L. CORRECTIVE ACTION: DAMAGED AREA REPAIRED PER B767-300 SRM 51-40-02. (1481698) - [SDR DALA2026031101680](https://openairdocs.org/sdr/DALA2026031101680.md): Seat Track · corroded · Mar 5, 2026 · N188DN · Boeing 767332 · Fuselage, Seat/Cargo Attach Fittings > SHIP 188 CABIN FOUND SEAT TRACK UPPER SURFACE CORROSION AT STA1443.85 RBL88.5. CORRECTIVE ACTION: DAMAGED AREA REPAIRED PER B767-300 ER/A 632473-14. (1479657) - [SDR DALA2026031101679](https://openairdocs.org/sdr/DALA2026031101679.md): Seat Track · corroded · Mar 5, 2026 · N188DN · Boeing 767332 · Fuselage, Seat/Cargo Attach Fittings > SHIP 188 CABIN FOUND SEAT TRACK UPPER SURFACE CORROSION AT STA1383 LBL88.5, CORRECTIVE ACTION: THE DAMAGED SEAT TRACK REMOVED AND REPLACED AS PER B767-300 SRM51-40-02. (1479926) - [SDR DALA2026031101678](https://openairdocs.org/sdr/DALA2026031101678.md): Skin · cracked · Mar 5, 2026 · N188DN · Boeing 767332 · Fuselage Main, Plate/Skin > SHIP 188 CRACK WAS FOUND DURING NDT INSPECTION OF FWD PAX DOOR CUTOUT AFT LOWER CORNER. CORRECTIVE ACTION: DAMAGED AREA REPAIRED PER B767-300 SRM53-10 -01. (1479903) - [SDR DALA2026031101677](https://openairdocs.org/sdr/DALA2026031101677.md): Skin · cracked · Mar 5, 2026 · N188DN · Boeing 767332 · Fuselage Main, Plate/Skin > SHIP 188 CRACK WAS FOUND DURING NDT INSPECTION OF FWD SERV DOOR CUTOUT AFT LOWER CORNER. CORRECTIVE ACTION: DAMAGED AREA REPAIRED PER B767-300 SRM53-10-01-2R. (1479894) - [SDR DALA2026031101676](https://openairdocs.org/sdr/DALA2026031101676.md): Seat Track · corroded · Mar 5, 2026 · N188DN · Boeing 767332 · Fuselage, Seat/Cargo Attach Fittings > SHIP 188 CABIN FOUND SEAT TRACKS UPPER SURFACE CORROSION AT STA1307 LBL88.5. CORRECTIVE ACTION: DAMAGED AREA REPAIRED PER B767-300 SRM53-00-52-2R-3. (1479695) - [SDR DALA2025122809435](https://openairdocs.org/sdr/DALA2025122809435.md): Light · inoperative · Dec 18, 2025 · N188DN · Boeing 767332 · Door Warning System > DURING PDC CABIN WALK THROUGH, FOUND 4R DOOR SLIDE ARM LIGHT INOPERATIVE. REMOVED AND REPLACED SLIDE LIGHT ASSY REF B767 AMM 33-51. OPC CHECK NORMAL. (8054536) - [SDR DALA2025081306039](https://openairdocs.org/sdr/DALA2025081306039.md): Indicator · inoperative · Aug 7, 2025 · N188DN · Boeing 767332 · Door Warning System > SLIDE INDICATOR LIGHT INOP OR DAMAGED / LOCATIONS:601. FOUND DOOR 2 RIGHT LIGHT OUT. REPLACED THE SAME. OK FOR SERVICE. - [SDR DALA2025063004846](https://openairdocs.org/sdr/DALA2025063004846.md): Switch · faulted · Jun 29, 2025 · N188DN · Boeing 767332 · Door Warning System > SHIP 188 2R DOOR SLIDE INDICATION ON THE 1L PANEL IS INOP. ENTRY/SERVICE DOOR SLIDE ARMED INDICATING LIGHT SYSTEM. CORRECTIVE ACTION: R/R 2R DOOR SWITCH PER B767-300 AMM 23-34 (1053891) - [SDR DALA2025062704810](https://openairdocs.org/sdr/DALA2025062704810.md): Gate · fod · Jun 26, 2025 · N188DN · Boeing 767332 · Passenger/Crew Doors > SHIP 188 DOOR 1L EXTREMELY HARD TO ARM. ARMING HANDLE ALMOST IMPOSSIBLE TO MOVE. CORRECTIVE ACTION: REMOVED FOD FROM ARMING HANDLE FLAP. DOOR ARMS NORMAL. (7345006) - [SDR DALA2025061704566](https://openairdocs.org/sdr/DALA2025061704566.md): Flag · broken · Jun 16, 2025 · N188DN · Boeing 767332 · Emergency Equipment > SHIP 0188 1R DOOR SLIDE ARMED FLAG BROKEN. CORRECTIVE ACTION: R/R EMERGENCY SLIDE ARM/DISARM IAW B767-300 IPC 52-11-01-01. (1026728). - [SDR DALA2025053104174](https://openairdocs.org/sdr/DALA2025053104174.md): Indicator · inoperative · May 21, 2025 · N188DN · Boeing 767332 · Door Warning System > SHIP 188 1L DOOR'S SLIDE ARMED LIGHT WILL NOT ILLUMINATE. R/R 1L DOOR SLIDE ARMED LIGHT ASSEMBLYREF B767-300 AMM 52-73 (7571514) - [SDR DALA2025053104172](https://openairdocs.org/sdr/DALA2025053104172.md): Indication Sys · inoperative · May 18, 2025 · N188DN · Boeing 767332 · Door Warning System > SHIP 188 1R DOOR ARMED INDICATOR FLAG. FOUND ARMED/DISARMED WARNING FLAG INOP, REPLACED SAME PER B767- 300 AMM 52-11. OPS NML. (0972013) - [SDR DALA2025021901232](https://openairdocs.org/sdr/DALA2025021901232.md): Light · inoperative · Feb 15, 2025 · N188DN · Boeing 767332 · Door Warning System > SHIP 188 DOOR 1L SLIDE ARM LIGHT INOP ON DOOR, CORRECTIVE ACTION: REMOVED AND REPLACED LIGHT ASSY AS PER B7676-300 AMM 52-73. OPS CHK GOOD. MEL AND PLACARD REMOVED (6631856) - [SDR DALA2025012300548](https://openairdocs.org/sdr/DALA2025012300548.md): Door · fod · Jan 18, 2025 · N188DN · Boeing 767332 · Door Warning System > SHIP 188 1R DOOR GRIT BAR NOT SECURE CLOSED. DOOR CLOSED INDICATOR INDICATED NOT FULLY EXTENDED. CORRECTIVE ACTION: REMOVED FOD IN 1R DOOR LINING. DOOR CLOSE AND LATCH GOOD. A/C OK FOR SVC PER B767-3 AMM 5211. (6630752) - [SDR DALA2024103010518](https://openairdocs.org/sdr/DALA2024103010518.md): Pin · out of adjust · Oct 29, 2024 · N188DN · Boeing 767332 · Door Warning System > SHIP 188 R FWD ENT DOOR EICAS ADVISORY MSG AND ENTRY DOORS LIGHT SHOW WITH R1 DOOR CLOSED. CORRECTIVE ACTION: FOUND EXCESSIVE CLEARANCE BETWEEM R1 LATCH PIN CABLE END AND PROX SW S197. ADJUSTED/DECREASED CLEARANCE BETWEEN LATCH PIN AND SENSOR S197 BY TURNING T - [SDR DALA2024101710147](https://openairdocs.org/sdr/DALA2024101710147.md): Placard · detached · Oct 12, 2024 · N188DN · Boeing 767332 · Placards and Markings > SHIP 188 DISARM LEVERSIGN FELL OFF LOC 601. CORRECTIVE ACTION: REPOSITIONED & SECURED OK. (0604974) - [SDR DALA2024083008591](https://openairdocs.org/sdr/DALA2024083008591.md): Light · inoperative · Aug 27, 2024 · N188DN · Boeing 767332 · Emergency Lighting > SHIP 188 ROW 46 LEFT & ROW 53 LEFT EMERGENCY PATH LIGHTS INOP. CORRECTIVE ACTION: FWD TO MEL 33-51-03A, PLACARD INSTALLED. (6174801) - [SDR DALA2024082308400](https://openairdocs.org/sdr/DALA2024082308400.md): Slide · unserviceable · Aug 22, 2024 · N188DN · Boeing 767332 · Escape Slide > SHIP 188 DURING AMDS 2501-01294-0102, FOUND RT OVERWING SLIDE UNSERVICEABLE. CORRECTIVE ACTION: RMVD RT OVERWING SLIDE PER W/C 2561-4697. (6179479) - [SDR DALA2024081608205](https://openairdocs.org/sdr/DALA2024081608205.md): Cable · out of adjust · Aug 14, 2024 · N188DN · Boeing 767332 · Emergency Equipment > SHIP 188 LH AFT SLIDE LIGHT FLASHING WHEN ARMED. CORRECTIVE ACTION: WITH LIGHT FLASHING THE PSEU SWHOW S205 FAR. PERFORMED FINE ADJUSTMENT OF LATCH PIN CABLE PER B767 AMM 52-11-00-825-008 STEP 6F. OPS CK OK (6179427) - [SDR DALA2024070206682](https://openairdocs.org/sdr/DALA2024070206682.md): Indication Sys · malfunctioned · Jun 26, 2024 · N188DN · Boeing 767332 · Door Warning System > SHIP 188 RT FWD ENTRY DOOR INDICATES OPEN WHEN CLOSED. CORRECTIVE ACTION: CYCLED DOOR 1R IAW B767 AMM 52-11NO FAULTS FOUND A/C OK FOR SVC (4486046) - [SDR DALA2024060405790](https://openairdocs.org/sdr/DALA2024060405790.md): None · none · Jun 2, 2024 · N188DN · Boeing 767332 · Standard Practices/Structures > DOOR 1R TOOK TWO TIMES OPENING AND CLOSING IT FOR EICAS/OVERHEAD ENTRY DOOR LIGHT TO GO OUT. CORRECTIVE ACTION: CLEANED DOOR LOCKED SENSOR S296 & 297 OPERATED DOOR THRU SEVERAL CYCLES CHECKS GOOD ACCOMP IAW B767-300 AMM 52-71-00-82. - [SDR DALA2024053105711](https://openairdocs.org/sdr/DALA2024053105711.md): Fan · odor · May 29, 2024 · N188DN · Boeing 767332 · Air Distribution Fan > SHIP 188 WE NOTICED A FAINT ODOR IN COCKPIT. BURNING SMELL. GOT L RECIRC EICAS MSG. DID QRH FOR L RECIRC AND SMOKE+FUMES, DONNED MASKS. TURNING OFF RECIRC FAN CAUSED FUMES TO DISSIPATE. CORRECTIVE ACTION: R/R LEFT RECIRC FAN AND LEFT/RIGHT RECIRC AIR FILTERS I - [SDR DALA2024041504456](https://openairdocs.org/sdr/DALA2024041504456.md): Unknown · odor · Apr 12, 2024 · N188DN · Boeing 767332 · Air Distribution System > SHIP 188 WHILE TAXIING FOR TAKEOFF THE FLIGHT ATTENDANT CALLED AND SAID THERE WAS A VERY STRONG SMELL OF FUEL MUCH STRONGER THAN NORMAL ENGINS WERE STARTED WITH A HEADWIND / NO OTHER AIRCRAFT IN AREA. DURING ENGINE RUN FOR MAINTENANCE THE LEFT ENGINE PRODUCED - [SDR DALA2024040304047](https://openairdocs.org/sdr/DALA2024040304047.md): Bottle · no test · Apr 1, 2024 · N188DN · Boeing 767332 · Emergency Equipment > SHIP 188 RH OFF WING SLIDE CYLINDER BOTTLE FAILED TEST. CORRECTIVE ACTION: REMOVED AND REPLACED RH OFF WING SLIDE CYLINDER BOTTLE REF AMDS CARD 2561-4723-RH (0272152) - [SDR DALA2024031503370](https://openairdocs.org/sdr/DALA2024031503370.md): Support Rod · broken · Mar 14, 2024 · N188DN · Boeing 767332 · Escape Slide > SHIP 188 RH OFF-WING ESCAPE SLIDE SUPPORT ROD FOUND BROKEN. CORRECTIVE ACTION: REMOVED AND REPLACED RH OFF-WING ESCAPE SLIDE PACK,AS PER AMDS CARD 2561-4697 (0243928) - [SDR DALA2024031503367](https://openairdocs.org/sdr/DALA2024031503367.md): Frame Angle · cracked · Mar 14, 2024 · N188DN · Boeing 767332 · Fuselage Main, Frame > SHIP 188 FOUND CABIN L/H FRAME END FITTING CRACK AT STA 915. CORRECTIVE ACTION: FUSELAGE FRAME FITTING AT STA 916.4, LBL 97.42 CRACK. FABRICATED AND REPLACED AS PER PRI: 616386-14 (0243896) - [SDR DALA2024031903491](https://openairdocs.org/sdr/DALA2024031903491.md): Bulkhead · corroded · Mar 13, 2024 · N188DN · Boeing 767332 · Fuselage Main, Bulkhead > SHIP 188 FOUND CORROSION AT STA 955 RBL 13 UPPER BULKHEAD. CORRECTIVE ACTION: DAMAGED AREA REPAIRED PER ER/A:616440-14. (0242589) - [SDR DALA2024031203253](https://openairdocs.org/sdr/DALA2024031203253.md): Bulkhead · corroded · Mar 11, 2024 · N188DN · Boeing 767332 · Fuselage Main, Bulkhead > SHIP 188 FOUND CORROSION AT STA 955 RBL 77 UPPER BULKHEAD. CORRECTIVE ACTION: THE REWORKED AREA BLENT OUT REPAIR AS PER PRI:616329-14 (0239436) - [SDR DALA2024030603080](https://openairdocs.org/sdr/DALA2024030603080.md): Fitting · cracked · Mar 6, 2024 · N188DN · Boeing 767332 · Fuselage Main, Structure > SHIP 188 FOUND CABIN R/H FRAME END FITTING CRACK AT STA 927. CORRECTIVE ACTION: THE FRAME END FITTING REMOVED AND REPLACED AT STA 927 R/H AS PER B767-300 SRM 51-40-02 (0231933) - [SDR DALA2024022002317](https://openairdocs.org/sdr/DALA2024022002317.md): Skin · damaged · Feb 17, 2024 · N188DN · Boeing 767332 · Fuselage Main, Plate/Skin > SHIP 188 FOUND ON ARRIVAL SKIN DAMAGE AT AFT LAV VACUUM BLOWER EXHAUST/ TANK VENT CUTOUT LOWER PORTION OF CUTOUT. CORRECTIVE ACTION: DAMAGED AREA REPAIRED PER B767 SRM 53-60-01-2R-3. (5770733) - [SDR DALA2024020801679](https://openairdocs.org/sdr/DALA2024020801679.md): Mechanism · lack of lube · Feb 4, 2024 · N188DN · Boeing 767332 · Service Doors > SHIP 188 1R DOOR WILL NOT ARM. CORRECTIVE ACTION: LUBED DOOR ARM MECHANISM PER B767 AMM 52-00 DOOR ARMS/DISARMS. ALL OPS CK GOOD. (4565284) Next page: https://openairdocs.org/aircraft/N188DN/reports.md?page=2 ## The whole list in SQL Runs in DuckDB 1.2 or later on the release's Parquet files over HTTPS: ```sql SELECT sdr_id, difficulty_date, n_number, aircraft_make, aircraft_model, part_name, part_condition, jasc_code, discrepancy FROM 'https://openairdocs.org/data/latest/faa_service_difficulty_report.parquet' WHERE n_number = 'N188DN' AND registry_match = 'registration' ORDER BY difficulty_date DESC ``` This list as a web page: https://openairdocs.org/aircraft/N188DN/reports --- OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.