§ 90.101 - Applicability.

§ 90.102 - Definitions.

§ 90.103 - Exhaust emission standards.

§ 90.104 - Compliance with emission standards.

§ 90.105 - Useful life periods for Phase 2 engines.

§ 90.106 - Certificate of conformity.

§ 90.107 - Application for certification.

§ 90.108 - Certification.

§ 90.109 - Requirement of certification - closed crankcase.

§ 90.110 - Requirement of certification - prohibited controls.

§ 90.111 - Requirement of certification - prohibition of defeat devices.

§ 90.112 - Requirement of certification - adjustable parameters.

§ 90.113 - In-use testing program for Phase 1 engines.

§ 90.114 - Requirement of certification - engine information label.

§ 90.115 - Requirement of certification - supplying production engines upon request.

§ 90.116 - Certification procedure - determining engine displacement, engine class, and engine families.

§ 90.117 - Certification procedure - test engine selection.

§ 90.118 - Certification procedure - service accumulation and usage of deterioration factors.

§ 90.119 - Certification procedure - testing.

§ 90.120 - Certification procedure - use of special test procedures.

§ 90.121 - Certification procedure - recordkeeping.

§ 90.122 - Amending the application and certificate of conformity.

§ 90.123 - Denial, revocation of certificate of conformity.

§ 90.124 - Request for hearing.

§ 90.125 - Hearing procedures.

§ 90.126 - Right of entry and access.

§ 90.127 - Fuel line permeation from nonhandheld engines and equipment.

§ 90.128 - Installation instructions.

§ 90.129 - Fuel tank permeation from handheld engines and equipment.