Airworthiness Directive · Amendment 39-11801 · Empresa Brasileira de Aeronautica S.A. (EMBRAER) Model EMB-135 and EMB-145 Series Airplanes
Empresa Brasileira de Aeronautica S.A. (EMBRAER) Model EMB-135 and EMB-145 Series Airplanes
Superseded. A later AD replaced this one: AD 2004-19-03. Comply with the one in force.
Model EMB-135 and EMB-145 series airplanes; serial numbers 145095, 145099, 145179, 145189, 145197, 145198, 145209 through 145244 inclusive, and 145246 through 145249 inclusive; AND serial numbers 145004 through 145094 inclusive, 145096 through 145098 inclusive, 145100 through 145103 inclusive, 145105 through 145121 inclusive, 145123 through 145139 inclusive, 145141 through 145153 inclusive, 145155 through 145178 inclusive, 145180 through 145188 inclusive, 145190 through 145196 inclusive, and 145199 through 145208 inclusive, on which EMBRAER Service Bulletin No. 145-36-0017, dated March 28, 2000, has been accomplished; certificated in any category.
Note 1: This AD applies to each airplane identified in the preceding applicability provision, regardless of whether it has been otherwise modified, altered, or repaired in the area subject to the requirements of this AD. For airplanes that have been modified, altered, or repaired so that the performance of the requirements of this AD is affected, the owner/operator must request approval for an alternative method of compliance in accordance with paragraph (d) of this AD. The request should include an assessment of the effect of the modification, alteration, or repair on the unsafe condition addressed by this AD; and, if the unsafe condition has not been eliminated, the request should include specific proposed actions to address it.
This amendment adopts a new airworthiness directive (AD) that is applicable to certain EMBRAER Model EMB-135 and EMB-145 series airplanes. This action requires revising the Airplane Flight Manual, and eventual disconnection of the precooler differential pressure switches. This action is necessary to prevent incorrect operation of the precooler differential pressure switches, which could result in inappropriate automatic shutoff of the engine bleed valve, and consequent inability to restart a failed engine using cross-bleed from the other engine or possible failure of the anti-ice system. This action is also necessary to ensure that the flight crew is advised of the procedures necessary to restart an engine in flight using the auxiliary power unit.
To prevent incorrect operation of the precooler differential pressure switches, which could result in inappropriate automatic shutoff of the engine bleed valve, and consequent inability to perform engine cross-bleed restarts or possible failure of the anti-ice system; and to ensure that the flight crew is advised of proper procedures to restart an engine using the auxiliary power unit; accomplish the following:
(a) Within 24 hours after the effective date of this AD, revise the Limitations section of the FAA-approved Airplane Flight Manual (AFM) to include the following statements. This may be accomplished by inserting a copy of this AD into the AFM. Following accomplishment of paragraph (c) of this AD, the revisions required by this paragraph may be removed from the AFM.
(b) Within 24 hours after the effective date of this AD, replace the existing “ENGINE AIRSTART” procedure in the Abnormal Procedures section of the AFM with the following procedures. This may be accomplished by inserting a copy of this AD into the AFM.
| Affected engine: | |
| One Electric Fuel Pump (A or B) | ON |
| Ignition | AUTO |
| Start/Stop Selector | STOP |
| Engine Bleed | CLOSE |
| Thrust Lever | IDLE |
| Airspeed and Altitude | REFER TO AIRSTART ENVELOPE |
Perform an assisted start or windmilling, as required.
CAUTION: IN ICING CONDITIONS USE CROSSBLEED START ONLY, TO AVOID LOSS OF ANTI-ICE SYSTEM PERFORMANCE.
| Assisted Start: | |
| Crossbleed Start: | |
| N2 (operating engine) | ABOVE 80% |
| Crossbleed | AUTO OR OPEN |
| Engine Bleed (operating engine) | OPEN |
| APU bleed start: | |
| APU | START |
| APU Bleed | OPEN |
| Crossbleed | AUTO |
| Engine Bleed (operating engine) | CLOSE |
| Start/Stop Selector | START, THEN RUN |
| Engine Indication | MONITOR |
Check ITT and N2 rising. Observe limits. Check ignition and fuel flow indication at 10% N2.
| Windmilling Start: | |
| Airspeed | ABOVE 260 KIAS |
| Minimum N2 | 12% |
| Start/Stop Selector | START, THEN RUN |
| ITT and N2 | MONITOR |
Note: Windmilling start will be slower than an assisted start. Windmilling start with N2 above 30% and increasing, the loss of altitude may be minimized, by reducing airspeed. Start will be faster if ITT is below 320°C.
| After Start: | |
| Affected Engine Bleed | AS REQUIRED |
| Crossbleed | AUTO |
| APU Bleed | AS REQUIRED” |
(c) Within 100 flight hours after the effective date of this AD, disconnect the electrical connector from the precooler differential pressure switches in the left and right engine pylons, in accordance with EMBRAER Alert Service Bulletin No. 145-36-A018, dated April 14, 2000. Following accomplishment of this paragraph, the AFM revision required by paragraph (a) of this AD may be removed from the AFM.
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
Aircraft
