AD 98-21-28

Airworthiness Directives; British Aerospace Jetstream Model 3101 Airplanes

1 · Quick read — prepared by AircraftDirectives

Our plain-language summary — not the regulation

Requires modifying the propeller de-icing system to assure system performance at low ambient temperatures.

AD number: 98-21-28
Federal Register document: 98-32473
Citation: 63 FR 67576
Amendment: 39-10836
Docket: Docket No. 98-CE-63-AD
Action: Direct final rule; confirmation of effective date.
Published: 1998-12-08
Effective: 1999-01-15
Effective (as stated in the rule): January 15, 1999.
Issued by: Transportation Department, Federal Aviation Administration
Regulation: 14 CFR 39
Applies to (in our index): British Aerospace Jetstream 31/32

2 · Official Federal Register document — government source, verbatim

Reproduced unedited from the Federal Register

[Federal Register Volume 63, Number 235 (Tuesday, December 8, 1998)]
[Rules and Regulations]
[Page 67576]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 98-32473]


[[Page 67576]]

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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. 98-CE-63-AD; Amendment 39-10836; AD 98-21-28]
RIN 2120-AA64


Airworthiness Directives; British Aerospace Jetstream Model 3101 
Airplanes

AGENCY: Federal Aviation Administration, DOT.

ACTION: Direct final rule; confirmation of effective date.

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SUMMARY: This action confirms the effective date of Airworthiness 
Directive (AD) 98-21-28, which applies to certain British Aerospace 
Jetstream Model 3101 airplanes. AD 98-21-28 requires modifying the 
propeller de-icing system to assure system performance at low ambient 
temperatures. This AD was the result of mandatory continuing 
airworthiness information (MCAI) issued by the airworthiness authority 
for the United Kingdom. The actions specified in this AD are intended 
to prevent propeller-induced vibrations from occurring during icing 
encounters at low ambient temperatures, which could result in decreased 
performance of the de-icing system during icing encounters with 
possible loss of control of the airplane.

EFFECTIVE DATE: January 15, 1999.

FOR FURTHER INFORMATION CONTACT: Mr. S.M. Nagarajan, Aerospace 
Engineer, FAA, Small Airplane Directorate, 1201 Walnut, suite 900, 
Kansas City, Missouri 64106; telephone: (816) 426-6932; facsimile: 
(816) 426-2169.

SUPPLEMENTARY INFORMATION: The FAA published this direct final rule 
with request for comments in the Federal Register on October 14, 1998 
(63 FR 55015). The FAA uses the direct final rulemaking procedure for a 
non-controversial rule where the FAA anticipates that there will be no 
adverse public comment. This direct final rule advised the public that 
no adverse comments were anticipated, and that unless a written adverse 
comment, or a written notice of intent to submit such an adverse 
comment, was received within the comment period, the regulation would 
become effective on January 15, 1999. No adverse comments were 
received, and thus this notice confirms that this final rule will 
become effective on that date.

    Issued in Kansas City, Missouri, on December 1, 1998.
James E. Jackson,
Acting Manager, Small Airplane Directorate, Aircraft Certification 
Service.
[FR Doc. 98-32473 Filed 12-7-98; 8:45 am]
BILLING CODE 4910-13-U

Sources. Section 1 is written by AircraftDirectives from the record below and is a reading aid only. Section 2 is the United States Government's own text, reproduced without edit.

Federal Register: https://www.federalregister.gov/documents/1998/12/08/98-32473/airworthiness-directives-british-aerospace-jetstream-model-3101-airplanes

Official PDF: https://www.govinfo.gov/content/pkg/FR-1998-12-08/pdf/98-32473.pdf

Packet generated 2026-08-18 08:12 UTC.

This packet is not an airworthiness determination and not legal or maintenance advice. AircraftDirectives reproduces official records and condenses their wording for easier reading. It does not decide, certify or imply whether any aircraft, engine, appliance or part is airworthy, compliant, affected by this directive, or eligible for return to service. No inspection, approval, or determination of any kind is performed or implied by this document.

Section 1 is a reading aid, not the rule. It is our own plain-language condensation, written to help a reader find the relevant directive quickly. It is NOT a substitute for the regulation, it may omit conditions, exceptions, compliance times, alternative methods of compliance (AMOCs) and applicability limits, and it has no legal force whatsoever. Only the official text governs. Where Section 1 and Section 2 differ in any respect, Section 2 - and the official source it was retrieved from - controls absolutely.

Responsibility remains with the owner/operator. Under 14 CFR §91.403 and §91.417 the owner or operator is responsible for maintaining airworthiness and for required records; under §39.7 no person may operate a product to which an airworthiness directive applies except in accordance with that directive. Determining applicability to a specific serial number and configuration, and performing or supervising any required action, is the responsibility of the owner/operator and appropriately certificated personnel.

Accuracy and currency. Section 2 was retrieved at the time stamped above and is reproduced without edit; Federal Register material is a work of the United States Government. Directives are amended, corrected and superseded over time, and this sheet is a snapshot, not a live record - it does not update after printing. Re-check the official sources before acting on it. This packet is provided without warranty of any kind, express or implied, including fitness for a particular purpose. We do not sell parts and have no commercial interest in any action a directive may require.