This section of the FEDERAL REGISTER

contains documents other than rules or

proposed rules that are applicable to the

public. Notices of hearings and investigations,

committee meetings, agency decisions and

rulings, delegations of authority, filing of

petitions and applications and agency

statements of organization and functions are

examples of documents appearing in this

section.

Notices Federal Register

368 

Vol. 84, No. 17 

Friday, January 25, 2019 

DEPARTMENT OF DEFENSE 

Department of the Air Force 

2017 Public Interface Control Working 

Group and Forum for the NAVSTAR 

GPS Public Documents 

AGENCY: Global Positioning System 

Directorate (GPSD), Department of the 

Air Force, Department of Defense. 

ACTION: The Global Positioning 

System Testing notice. 

SUMMARY: This notice informs the public 

that the Space and Missiles Center 

Global Positioning Systems (GPS) 

Directorate Engineering (SMC/GPE) 

Systems Integration Demonstration (SI 

Demo) team plans to execute a test in 

February 2019 to investigate legacy 

receiver week roll-over behavior and 

analyze any off-nominal behavior 

exhibited. Additonal details about the 

test and how interested civil vendors 

may participate is detailed below. 

DATES: Questionaire due by February 4, 

2019. 

ADDRESSES: SMC/GPE, 483 North 

Aviation Boulevard, El Segundo, CA 

90245–2808. 

SUPPLEMENTARY INFORMATION: The 

Global Positioning System (GPS) week 

number rollover occurs in the GPS 

legacy navigation (LNAV) message every 

1024 weeks due to the GPS week 

number being represented by only 10 

bits within the LNAV message. The next 

GPS week number roll over will occur 

18 seconds prior to the 0000Z boundary 

(Coordinated Universal Time) between 

April 6/7 2019. In most cases, any 

negative response from a GPS receiver 

caused by a problem accounting for the 

10-bit week number week roll over 

would likely affect the calendar 

conversion from GPS time to UTC date/ 

time and could result in the GPS 

receiver thinking it had jumped 

backward in time by 1024 weeks to 21/ 

22 August 1999. Many receiver-specific 

design documents contain requirements 

that ensure proper handling of a rollover 

event. However, SMC/GPE does not 

control, maintain, or even have an 

awareness of the software and 

requirements baseline of every GPS 

receiver in operation. Many 

performance conditions, especially 

those in older GPS receivers, may differ 

from expectations laid out in 

modernized receiver-specific design 

documents. It should be noted that the 

modernized civil navigation (CNAV) 

signals all utilize a 13-bit week number 

representation and the use of those 

CNAV signals can delay potential week 

number roll-over problems to 5/6 

January 2137. Below are a few questions 

whose answers would help SMC/GPE 

understand your receiver’s expected 

behavior during the upcoming GPS 10- 

bit week number roll-over: 

1. Does your strategy involve user 

input? 

2. Do the users understand and know 

the procedure? 

3. Is the procedure detailed in a 

manual or other document? 

4. Is the procedure, manual, or 

documentation posted on your website? 

5. Are there concerns for any 

automated systems your receiver is 

integrated into? 

6. Do you plan on posting product 

advisories for each receiver type? If so, 

where? 

7. Has testing been planned/ 

completed to confirm receiver 

performance expectations? 

8. Would you be interested in 

participating in the test by either: 1) 

Supplying receivers & technical support 

to test with the government team? 2) 

Testing using your own test setup and 

configuration? 

9. How many receiver types would 

you be able to supply/test for this effort? 

(Note, not all receiver types may be 

applicable to this test event.) 

If you wish to participate in this test, 

please submit the answers to the 

questions above to SMC/GPE mailbox at 

smc.gpev.sidemo28@us.af.mil by 

February 4, 2019. After the submition of 

the questinaire, the SI Demo team will 

schedule individual meetings with 

interested civil vendors to further 

discuss their participation in the test in 

more detail. 

FOR FURTHER INFORMATION CONTACT: 2Lt 

Marcy Gouri (marcy.gouri@us.af.mil) or 

Capt Aaron Knoblauch 

(aaron.knoblauch@us.af.mil) 

Henry Williams, 

Acting Air Force Federal Register Liaison 

Officer. 

[FR Doc. 2019–00111 Filed 1–24–19; 8:45 am] 

BILLING CODE 5001–10–P 

DEPARTMENT OF HEALTH AND 

HUMAN SERVICES 

National Institutes of Health 

Draft NTP Monograph on the 

Systematic Review of Evidence of 

Long-Term Neurological Effects 

Following Acute Exposure to the 

Organophosphorus Nerve Agent Sarin; 

Availability of Document; Request for 

Comments; Notice of Peer-Review 

Meeting; Amended Notice 

AGENCY: National Institutes of Health, 

HHS. 

ACTION: Notice. 

SUMMARY: This notice amends Federal 

Register notice 83 FR 63662, published 

December 11, 2018, announcing the 

availability of the Draft National 

Toxicology Program (NTP) Monograph 

on the Systematic Review of Evidence of 

Long-Term Neurological Effects 

Following Acute Exposure to the 

Organophosphorus Nerve Agent Sarin 

for public comment prior to peer 

review. In partnership with the National 

Institutes of Health (NIH) 

Countermeasures Against Chemical 

Threats (CounterACT) Program, the 

Office of Health Assessment and 

Translation (OHAT), Division of the 

National Toxicology Program (DNTP), 

National Institute of Environmental 

Health Sciences (NIEHS), conducted a 

systematic review to evaluate the 

evidence of long-term neurological 

damage in humans after acute, sublethal exposure to sarin. The peerreview meeting will be held by webcast 

only and open to the public; registration 

will be required for attendance by 

webcast and to present oral comments. 

Information about the meeting and 

registration is available at https://

ntp.niehs.nih.gov/go/36051. 

DATES:

Meeting: Scheduled for February 4, 

2019, 9:00 a.m. Eastern Standard Time 

(EST) to adjournment. The preliminary 

agenda is available at https:// 


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